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1.
The stale, sour smoke left in a bong chamber from an unfinished hit.
A stoner faux pas, passing a bong containing a buffalo fart is akin to farting in a full elevator.

Also used in the southern US to describe the rank smell of a burning marijuana seed. Failing to remove all the seeds is also a faux pas due to this stink.
"Dude, finish your hit! You handed me a buffalo fart!"
"Dude, clean your weed next time, that buffalo fart reeks!"
by Apogee November 30, 2006

Words related to buffalo fart

bong marijuana weed beefcake fart joint pot smoke tight lung
 
2.
The act of shooting your bowl of weed out of the pipe, bong, or smoking device by coughing while taking a fat ass rip.
Fuck dude - you buffalo farted.
by JAM May 16, 2004