Top Definition
A really witty thing to say or call someone, even if you have no idea what it means. Because No one else does either.
You: "Knock Knock Mosacra!"

or

Friend: "Hey man"
You: "Hey whats up Mosacra?"
by HoveringCoyote January 10, 2011
1 more definition
Anything and everything, nothing specific.
You mosacra!
That one bad mosacra.
by Lifesplitters January 12, 2011

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