Top Definition
Someone that butseckses with fist. Butt mash (Verb) To Mash the asshole with extreme force. To make ass like goatse. O_o
Guy 1: Dude he butt mashed him to goatse lvl.OMFG!!!!!1111!!!!1111one1!!!!!!!111
Guy 2: No fucking way HAX. He was Butt mashed that bad???WTF
Butt Mashed guy: It wasnt that bad!!!

Guy 1: He liked it what a fag!
by O_oXD>_< July 12, 2005
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