OMG! 

Usually said in chat rooms or online forums etc. Short form of "OH MY GOD!!!"

"OMG"
"WTF?"
"LOL"
"WTF?"
"ROFL!"
etc

OMG! by Kristjan May 15, 2005

OMG! 

A very silly E Magazine from Yahoo with rubbishy stories that would only entertain preteen girls

This week in OMG! :

Katy Perry gets stung by a bee
Simon Cowell slips on a banana skin
Kate Middleton shops in New Look

OMG! by Deathflower November 13, 2012

OMG! 

an excessively over used phrase brought on by lazy teens who don't feel like typing oh my god.

OMG! i broke a nail.

OMG! by Emma Tom May 19, 2007

omg! 

= oh my god! its short term! which like every1 nos! so y would u wanna look it up??? REATARDS!!!!!

' omg i cant belive ppl dont no wot it means '

omg! by ?? August 11, 2004

Omg

Orange mice gaming.

You know what omg is.

Omg by Anonymouse🐀 December 15, 2018

omg

Possibly the most irritating piece of chatroom vernacular in existence. Often used by teenage girls in chatroom who, for some reason, punctuate their sentences with "Like", "Totally", "soooooooo" and "Lolz."

Correct Response - "Speak proper, or STFU, N00B!"

"OMG WTF! u nevaz did dat, like, dats like, fkin gay! if i did dat id be like, wowz!!!!" - Actual AOL chat quote.

omg by KHD August 27, 2003

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.

OMG by Suffers in silence November 6, 2012