Top Definition
an expression originally used by half-white, half-black teenage males as a substitute for another word considered offensive, but misinterpreted by other males as "big throbbing penis."
-Knock knock.
-Who's there?
-ME AND MY BIG, BLACK HAHM!
by timmy tebow 15 January 27, 2009
1 more definition
An extremely violent, sudden, and sharp force expelled through the anus. A type of short, loud fart. Frequently followed by shortness of breath, spotty bleeding, and dry heaves. Usually accompanied by a foul, evil odor.
"So, yeah, Jerry, I met her at this bar and... hang on..." HAHM! "Whoa. I think I feel sick. I've gotta lie down. Later!"

OR

"Marcus let a Hahm and he was hospitalized for three weeks."
by Scrogginhammer February 09, 2007

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