2 definitions by Everythingtatseslikepurple

Abbreviation for "Oh My God". An expression of surprise, anger or disbelief. Used often in text messages and badly written emails. Used mainly by teenage girls, even if the event isn't all that surprising.
Girl 1: Omg, i just totally hooke dup with Ryan!
Girl 2: Omg what!
The sound one makes before exploding violently.
Person 1: Dude, you were supposed to cut the red wire, not the blue one.

Person 2: Oh crap.