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1.
Action in which one person bites the buttocks of another person for as long as they can. This is typically a party game in which someone yells "ass rodeo!" and goes after someone.
That bruise is from last night when Barrie busted out some ass rodeo.
by ap08 March 08, 2008
 
2.
What two or more gay cowboys do, also used to describe gay group sex, or some ruff violent anal sex.
"Those fags are heading to the Ass Rodeo"
by Derrick B August 23, 2006