2 definitions by Baron Marx

A branch of Jiu Jitsu, a martial art that focuses on self defense using grappling and ground fighting, where the practitioners employ the use of their own fecal matter to enhance the effectiveness of their submission techniques.
Student 1: "That guy Tony is a 3rd degree black belt in Poo Jitsu."
Student 2: "I heard that once he almost killed some dude, who refused to submit, using an ass-triangle lock!"
Student 1: "Yeah, if you get in the cage with him, things can go from good to shitty in a matter of seconds."
by Baron Marx August 21, 2013
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The act of two guys engaging in a masturbatory battle, inside a dome-shaped jungle gym, where the winner is the combatant who can climax first. (Note: During the battle, the jungle gym should be covered by the wagering spectators to prevent any random onlookers from seeing inside.)

Term references the film Mad Max Beyond Thunderdome's arena where opponents battle each other to the death.
"Make sure there's no kids around! Bob and Bill are going beyond thunderbone! Two men enter, one man leaves!"
by Baron Marx May 21, 2013
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