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1.
Farts which emerges from one's butt, and not another orifice.
After eating a large can of beans, Steve made many loud and disgusting buttfarts.
by A Cow Told Me To Write This August 13, 2007
 
2.
Gas released between the buttocks cheeks, expelled gently and or forcefully into the surrounding air. There are numerous methods of release, therefore qualifying a "buttfart" an art form medium. Of course, there are those who do not partake in the exiting and age long celebration of human air. Cheers!!!
"Nice, thats one hell of a buttfart Rick, did you enjoy it or was it rather unsettling?", " Rather Tom, I found that particular buttfart, satisfying and rewarding, a true, and excellent buttfart." "Whoo, stinky."
by Damien Williams May 06, 2008