look up any word, like the eiffel tower:
 
1.
A Fart
I need to go outside to expel my Butt Fumes
by Dollarbill1985 July 15, 2010
 
2.
stuff that comes out your ass. Almost always used in conjunction with fartgas. Buttfumes are always expelled and never erupted unless following fartgas in sentence.
I erupted fartgas and buttfumes.
I expelled buttfumes.
by lightyeersaway April 14, 2010