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1.
a mexican basketball game.
"oye vato lets go play some juan on juan"..."horale"
by felipe February 20, 2005
 
2.
When one mexican or beaner plays another mexican in basketball, this is considered to be "juan on juan"
"Hey Julio, do you wanna go get a burrito with me then play some juan on juan?"

"That juan on juan yesterday was real dope. Those guys were sweating so much, it looked like they were trying to cross the border or something."
by Gabby D. December 02, 2007