omgumf 

oh my god you mother fucker

I kissed youre girlfriend yesterday OMGUMF

omgumf by tyler wasmuth May 10, 2007

OMGLMFAO 

Literally, "Ohmigod, laughing my fucking ass off." Denotes something extremely funny.

"Dude, did you heard about Tori Amos? She got run over by weed wackers!"
"OMGLMFAO!"

OMGLMFAO by norapoleon January 15, 2007

omgtmf 

OMG Oh My God, Thats My Ferrari. Used if you need to do something but you forget or you just use it for a major event.
Originated from OMG.

Man, we have a test tomorrow!!! It's 2 in the morning and I didn't study! OMGTMF!!!

omgtmf by Army122 November 18, 2010