LMAO - laugh my @zz off
TY - Thank you
LOL - laugh out loud
Dh - Darling Husband or D Head, etc. - depending on your mood
Dd - Darling daughter
Ds - Darling son
D - In front of most family members means darling in general
OP - Original Poster
WTF - What the F...
BOGO - Buy one get one free
U - you
Avatar - The picture that you see when in your signature box area of your information/profile.
PM - Personal Message similar to IM instant message. Located also in your profile area.
Little Box that you see in each forum on the right side: This is to contact the administrator/moderator (they run the show)all at once in case you See Spam.
Writing in Caps- in general means you're yelling or excited

Hope this helps those that didn't know. I know many people do but this is to help those that are learning. If I missed any common one's that you know can you please add them too thanks so much

Bump for those that wanted to know.