Attached is a lingo sheet depicting slang words and what they mean.
Mostly for fishy stuff
Alphabetical arranged list of common abbreviations that may be encountered within the reef keeping hobby. If there is an abbreviation that has been left out, then please let the me know.

A
Amp
AC
Activated carbon, chemical filtration media / alternating current
AC
Alternating current
AF
Aquarium Frontiers, electronic magazine
AFAIK
As far as I know
AFM
Aquarium Fish Monthly, magazine
AISI
As I see it
ALK
Alkalinity, measure of buffering capacity of water
AOL
America Online, internet service provider
ASAP
As soon as possible
ASW
Artificial sea water
ATS
Algae turf scrubber, reef setup technique
B4
Before
BOD
Biological oxygen demand
BR
Base rock
BTA
Bubble tip anemone
BTW
By the way
Ca
Calcium
CaCl2
Calcium chloride
CaCO3
Calcium carbonate
Ca(OH)2
Calcium hydroxide
CC
Counter current, type of protein skimmer
Cl
Chlorine
CO2
Carbon dioxide
CO3
Carbonate
CR
Calcium reactor
CSD
Carlson surge device
CTA
Cellulose triacetate, type of RO membrane
Cu
Copper
CUL
See you later / catch you later
CUL8R
See you later / catch you later
CYANO
Cyanobacteria
DC
Direct current
DD
Downdraft, type of protein skimmer
DI
Deionisation, type of water purification
DIY
Do it yourself
dKH
Degrees of carbonate hardness, measure of alkalinity
DO
Dissolve oxygen
DOC
Dissolved organic carbon
DSB
Deep sand bed
FAMA
Freshwater and Marine Aquaria, magazine
FAQ
Frequently ask question
Fe
Iron
FFE
Flying Fish Express, mail order company, United States
FO
Fish only, type of marine aquarium
FOWLR
Fish only with live rock, type of marine aquarium
FW
Freshwater
FWIW
For what its worth
FYI
For your information
FYM
For your misinformation
GAC
Granular activated carbon
GAL
Gallon
GBR
Great Barrier Reef
GPH
Gallons per hour
HCO3
Hydrogen carbonate
HO
High output fluorescent light
HSA
High speed aeration, type of proteins skimmer
HTH
Hope this/that helps
I
Iodide
I2
Iodine
ID
Indentify/indetification
IE
Internet Explorer, WWW browser
IM
In my
IMCO
In my considered opinion
IME
In my experience
IMEO
In my expert opinion
IMHO
In my humble/honest opinion
IMNSHO
In my not so humble/honest opinion
IMO
In my opinion
IO3
Iodate
IOW
In other words
IR
Infrared, type of light of longer wavelength than visible light
IRC
Internet relay chat
ISP
Internet service provider
KALK
Kalkwasser, German for calcium hydroxide solution or limewater
KI
Potassium iodide
KISS
Keep it simple stupid
kW
Kilowatt
L8R
Later
LFS
Local fish store
LHS
Local hardware store
LOL
Laughing out loud
LPH
Litres per hour
LPS
Large polyped Scleractinian (stoney) coral
LR
Live rock
LS
Live sand
LT
Litre
mA
Milliamp
MACNA
Marine Aquaria Conference of North America, held annually
MACO
Marine Aquaria Courses Online
MASA
Marine Aquarium Societies of Australia
MASNA
Marine Aquarium Society of North America
MEQ/L
Milli-equivalents per litre, measure of alkalinity
Mg
Magnesium
MG/L
Milligrams per litre
MH
Metal halide light
MO
Mail order
mV
Millivolt
MV
Mercury vapour light
mW
Milliwatt
Na
Sodium
NaCO3
Sodium carbonate
NaOH
Sodium hydroxide
NCM
North Coast Marine, mail order company, United States
NG
Usenet newsgroup
NH3
Ammonia
NH4
Ammonium
NNR
Natural nitrate reduction, reef setup technique
NO
Normal output fluorescent light
NO2
Nitrite
NO3
Nitrate
NP
No problem
NRN
No reply necessary
NS
Netscape, WWW browser
NSW
Natural sea water
O2
Oxygen
OBTW
Oh by the way
ORP
Oxidative redox potential
OTOH
On the other hand
PAR
Photosynthetically available radiation, unit of measure of amount of light available to zooxanthellae and algae
PLS
Please
PC
Power compact fluorescent light
pH
Measure of the concentration of hydrogen ions, equal to -log[H+], <7 acidic, =7 neutral, >7 basic
PH
Powerhead, water pump
PO4
Phosphate
PPM
Parts per million, equivalent to mg/l (milligrams per litre)
PSI
Pounds per square inch
PVC
Poly vinyl chloride, used for piping / plumbing
RAMR
Usenet newsgroup rec.aquaria.marine.reefs
RC
Reef Central, website
RDO
reefs.org, website
RO
Reverse osmosis, type of water purification
RO/DI
Reverse osmosis, followed by deionisation, type of water purification
ROFL
Rolling on the floor laughing
ROFLOL
Rolling on the floor laughing out loud
ROTFL
Rolling on the floor laughing
ROTFLMAO
Rolling on the floor laughing my ass off
ROTFLOL
Rolling on the floor laughing out loud
RTAW
Reefing the Australian Way, Australian discussion board
RTN
Rapid tissue neucrosis
RUGF
Reverse flow undergravel filter
SAL
Salinity
SD
Surge device
SG
Specific gravity
SHO
Super high output fluorescent light, equivalent to power compact fluorescent
Si
Silicon
SiO2
Silicon dioxide
SITD
Still in the dark
SO
Significant other
SPS
Small polyped Scleractinian (stoney) coral
Sr
Strontium
SW
Saltwater / seawater
TAT
Thiel Aqua Tech, mail order company, United States
TBS
Tampa Bay Saltwater, mail order company, United States
TDS
Total dissolved solids
TFC
Thin film composite, type of RO membrane
TFN
Thanks for nothing
TIA
Thanks in advance
TIC
Tongue in cheek
TMCRA
The modern coral reef aquarium, book by Alf Nilsen and Svien Fossa
TRA
The reef aquarium, book by Charles Delbeek and Julian Sprung
TTYL
Talk to you later
TWP
Tap Water Purifier from Aquatic Pharmaceuticals
UGF
Undergravel filter
UV
Ultra violet, type of light of shorter wavelength than visible light
V
Volts
VHO
Very high output fluorescent light
W
Watt
WMC
Western Marine Conference, United States
WWW
World wide web
WYSIWYG
What you see is what you get
YMMV
Your mileage may vary
<g>
Grin
<G>
Big grin
<s>
Smile
<S>
Big smile
:-)
Smile
;-)
Smirk
:-(
Sad
:-O
Surprise

you expect all the newbies to learn this?? even i dont know 80% of it

heres a new one...... PISCS................ PUFF IS A ______ SUCKER hahaha

Harsh Blue SHoes HARSH

SALT WATER PIMP
SWP
BLUE SHOES
BS
DICKHEADERS
DH
PUFFEDUPSEAGULL
PUS

DMD - diet mountian dew

HMFIC - head mother F*CKER in charge


Dick Headers !!!!!!! where the f*ck have you been man ??? you missed like the whole winter bud........hows things

Boss