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1.
When a nigga got some dirty ass farts like shit.
Guy 1:"Dayum i've been fartin all dizzay!"

Guy 2:"Nigga you got Stank Butt "

Guy 1:"TRUUUUUUEEEEEE"
by Wazwaz March 30, 2011
 
2.
When a person accidentally poops while mooning someone, and the smell of their own feces causes them to make the stank face.
Cheryl had diarrhea, but had the sudden urge to moon Josh. While mooning Josh, Cheryl started to release her feces, and the smell caused her to express the stank face. And Josh experienced the full effects of the StankButt.
by PRUSUS June 30, 2014