Top Definition
A derivation of OMG(oh my gosh), OMGORILLA, just as with omg, is often used in the event of surprise and shock.

Usually describing someones exagerated response to an event or statement.

Generally not used for serious circumstances.
Guy1: Hey is that guy gonna catch-up?
Guy2: No, he's going to mayonnaise. *snicker*
Guy1: OMGORILLA. That's retarded. >_>
by Hormoneboy November 01, 2011
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