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1.
to be truthful, it is butt sex.
better known as: ass fuck.
dude 1: u wanna buttsmex?!? ;D
dude 2: nuu tanks, get sum frum tat dude! :D
dude 3: wtf i'm not gay like that... O_o
by Ophie.Teh.Odd.One September 02, 2009
 
2.
Male anal intercourse. Stories involving buttsmex are usually written by female fangirls for various pairinggs.
"That's a story with some hot buttsmex."
by DXMJUNKIE March 07, 2010