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1.
when a girl is giving you head and you pull out to pause and contemplate your next masterpiece, then you violently splatter-paint her face with jizz.
Bruce was drunk while getting head from his girlfriend so he decided to Jackson Pollack her face, and then later auction it off once he sobered up.
by Musclepants July 11, 2006
 
2.
extreme diarrhea
dude, i have to Jackson Pollack really bad, but i'm at my girlfriends house . . . shit

it is most commonly used when discussing past events. for instance: I hope you just jackson pollacked as intensely as i did. it must have been all the beer that did us in.
by beadsandark May 19, 2009