the act of inserting your fist into someones anus
i really gave seth killian a dirty bull last night
by Balrogs ugly cousin April 11, 2010
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Noun : Dirty Bull Nuts
The dirty testicles of a longhorn bull.
That longhorn sure does have some dirty bull nuts!

"Screw that, man, you wrecked my car so you can suck dirty bull nuts, asshole," said johnny as he trekked off angrily.
by Johnny [Jaywalker] February 4, 2009
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