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15.
Outlaw Motorcycle Gangs.

the offical term for 1%er motorcycle clubs used by the FBI.
The FBI say there are 5 main OMGs in the usa.
by Phileep Falop. April 11, 2009
 
16.
variant of ZOMG but written by those of us using the right-side shift key.

ZOMG is OMG with the Z that comes from pressing the shift + Z button (on accident) then typing OMG.

?OMG is for people like me that use the other shift key.

often confuses the hell out of people because they incorrectly think "oh my god??"

also used as ?OMGOSHHI2U
and ?OMGOSHHI2U2!
and for the ultimate shift-key misuse: ?OMGOSHHI@U@
?OMG I forgot it was tuesday!!!! stupid wow is down..
by Jerimy "Evil" Sandwich June 14, 2006
 
17.
omg
Commonly thought of as the acronym for "oh my god", however it really means "operate my gooch". The person on the receiving end of the remark must then lick, suck, fondle or somehow "operate" on the gooch of the one who made the remark.
Brennan- "Hey! What are you doing? Wanna come over?"
Linda- "I'm playing checkers, what about you?"
Brennan- "OMG. Me too! You should come over and we can play checkers then you can fondle my bacon strip and surrounding area!"
by cotswald November 23, 2008
 
18.
Literally means Oh, My Gods, ie. used by someone who believes in more than one god
OMGs, that's such a great link!
by Pixiespork January 12, 2008
 
19.
OMG
An abbrieviation for oh my god. Often used by immature young girls when talking in chatrooms.
Girl: OMG that dude is like so hot
Random guy: Hey you stupid bitch, is it so hard for you to spell oh my god.
by Mikinho August 25, 2006
 
20.
OMG
Oversized Male Genitalia (OMG): a genetic birth defect that grows the penis abnormally large or to absurdly large proportions.
Every year, thousands of men are diagnosed with OMG. Sadly, most are banished to the fringes of society, victims of their own freakish length and girth.
by Suffers in silence May 27, 2012
 
21.
OMG
Obama Must Go!
OMG, we have to recapture our nation and get the economy going again so I can get a job. OMG!
by Bob Knows November 16, 2011