Top definition
A male homosexual who assumes the passive position during an act of anal intercourse; a "bottom." So called becase of the discharge of semen into the bottom's rectum.
"In his anxiously awaited autobiography, songwriter extraordinaire Bernie Taupin reportedy claims that his erstwhile partner Sir Elton John was a 'sperm butt' during the years of their collaboration."

-- Liz Smith, NY Daily News
by Tunmy AuGratin February 25, 2006
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