if you know of anymore let me know and i can edit this list
Haven't seen this thread before but seeing that a few people have commented about its helpfulness, I've taken the liberty of updating it. Not sure if you're still about Chris, but if you want to copy/paste this into your OP it'll save digging through the suggestions... Given it a bit of a clean up and removed sentences mentioning links that aren't embedded as well as adding some of the more common ones suggested in the follow up posts. People can Google the words if they want more info.
A
A-DEP - Automatic Depth of Field
AE - Automatic Exposure
AE L - Automatic exposure lock
AEB - Auto-Exposure Bracketing
AF - Automatic Focus.
AF L - Automatic focus lock
AP (Nikon) - Aperture priority
AV (Canon) - Aperture priority
APS-C - Advanced Photo System type-C
AS - Antishake.
ASA - Definition of film speed.
B
BBF - Back button focus
BIF - Bird in flight
BMP - Also called Windows bitmap
Bulb - A shutter speed that lasts as long as you hold the shutter open
BSI - Back side illumination
BTL - Behind the Lens
B&W - Black and White
C
CCD - Charged Coupled Device: Image sensor technology.
CF - Compact Flash
CHDK - Canon Hackers Development Kit.
CIPA - Camera & Imaging Products Association
CLA - Cleaning, lubrication and adjustment.
CMOS - Complementary Metal Oxide Semiconductor
CMS - Colour Management System
CMYK - Cyan, Magenta, Yellow, Black
CSC - Compact system camera
CWB - Custom White Balance.
D
DI - Digital Imaging
DNG - Digital Negative (image format)
DOF - Depth of Field.
DP - Digital Photography
DPI - Dots per Inch.
DPOF -Digital Print Order Format
DR - Dynamic Range
D-SLR or DSLR - Digital Single Lens Reflex
DZ - Digital Zoom.
E
EC - Exposure Compensation
ETTR - Expose to the right
ETTL - Evaluative Through The Lens
ETTL - Expose to the left
EV - Exposure Value
EVF - Electronic Viewfinder
EXIF - Exchangeable Image File Format.
F
FEB - Flash Exposure Bracketing
FEC - Flash Exposure Compensation
FEL - Flash Exposure Lock
FF - Full Frame
FFS - When things go wrong
FOV - Field Of View
FPS - Frames per Second
FX - Full frame
G
GAS - Gear Acquisition Syndrome
GB - Gigabyte
GIF - Graphics Interchange Format.
Grad - Graduated filter
H
HDR - High Dynamic Range
HSS - High Speed Sync
I
IBIS - In Body Image Stabilisation
IF - Internal Focusing
ILC - Interchangeable lens camera
IR - Infrared
IS -Image Stabilisation
ISO - International Organisation for Standardisation. ISO isn't a TLA, it's derived from the greek word isos meaning "equal"
IQ - Image Quality
J
JPEG or JPG -Joint Photographic Experts Group.
K
KB - Kilobyte - 1024 of these go into 1mb
L
LCD - Liquid Crystal Display
LED - Light Emitting Diode
LF - Large format
LR - (Adobe) Lightroom
LTE - Long Time Exposure
M
M - Manual
MB - Megabyte
MF - Manual focus
MF - Medium format
MFT - Micro four thirds
MLU - Mirror Lock-up
MMC - MultiMedia Card.
MP - Megapixels.
MPEG - Moving Picture Experts Group
MS - Memory Stick.
N
ND Filters - Neutral Density Filters (see also Graduated ND Filters)
NFC - Near Field Communication
NR - Noise Reduction
NS@W - Not Safe @ Work (Also NSFW = Not Safe For Work (to be seen in thread titles or in front of websites))
O
OCF - Off Camera Flash
OCR - Optical Character Recognition.
OEM - Original Equipment Manufacturer
OLED - Organic light emitting diode
OOC - Out of Camera
OOF - Out of Focus
OP - Original Poster (Forums - the person who started the thread)
OTF - Off the Film
OVF - Optical Viewfinder
OZ - Optical Zoom.
P
P - Programmed auto-exposure
PASM - The dial with all the modes. Can be referred to as "the PASM dial"
PIC - Picture
PICS or PIX - Pictures
PJ - Photojournalism or Photojournalist
PNG - Portable Network Graphics.
PP -Post Processing
PPA - Professional Photographers of America
PPI - Pixels per Inch.
PQ - Picture Quality
PS - (Adobe) Photoshop
PSE - Photoshop Elements
PSP - Paintshop Pro.
Q
R
RF - Rangefinder
RTM - Read the manual (Also RTFM read the flippin' manual)
S
SD - Secure Digital: a memory card format for your digital camera.
SDHC- Secure Digital High Capacity.
SLR - Single Lens Reflex: the same thing as a D-SLR, only referring to film cameras.
SOOC - Straight Out of Camera
SP - Shutter Priority.
sRGB = Standard RGB Colour Space
SS - Shutter Speed.
SWMBO - She Who Must Be Obeyed
SWM - Silent Wave Motor, Low Noise fast focus, lens motor.
T
Tb - Terabyte - 1024 gb
TC - Teleconverter
TFP - Time For Prints
TFCD - Time For CD
TIFF or TIF - Tagged Image File Format.
Tog - Photographer.
TP - Talk Photography
TTL - Through-the-lens
TV - Time Value
U
USB - Universal Serial Bus
USM - Unsharp Mask
USM - Ultrasonic Motor
UWA - Ultra Wide Angle
V
VR - Vibration Reduction.
W
WA - Wide Angle
WB - White Balance.
WLF - Waist level finder
WS - Watt-Second
X
Y
Z