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1.
Also spelled "bhup" or "bup".

A word stated entirely on its own to express uncertainty, unconcern, indifference, or apathy; is usually said on its own as an expression in place of "I don't know" or "Doesn't Matter"
Jane: What time's the football game start, John?
John: Buhp.

Joe: Faaaack man tonight's gonna blow man....
James: Buhp....
by chawnsy March 15, 2012
 
2.
Fornication between two individuals that comes as a surprise to those that find out.
Wow, can you believe Joe and Jane buhped last night?!?

or

You're not gonna believe this but Kate and I buhped last night.
by Lex Shrapnel November 12, 2005