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1.
Another term for passing gas, or letting one "slip". The term you would use to take responsibility for a really, hot, stinky fart without actually saying so.
"Omigosh, I totally just harnin'. Sorry!"

or

"Hey! Did you just freaking fart???!?"

"O gawd, no! I just harnin'."
by Glambot June 12, 2013