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1.
This term is used when someone gets get owned and wants to say "Oh my god! Owned!" at the Same time.

Oh My God + Owned = O2MG
"Hahaha funny"
"That's what god said when he made your face"
"O2MG!!!!"
by C-late December 19, 2009

Words related to O2MG

omg ownage owned oh my god omfg own pwned zomg
 
2.
To declare immense dominance over an opponent or a situation with exclamation and enthusiasm. It combines ownage and omg by combining the two O's of each word.
The visiting team just O2MG'd the home team in basketball today.
by alloo December 19, 2009