1.) a concentrated collage of personal effects found to be sexually stimulating to the viewer; intended to be viewed during masturbation.
2.) a tool primarily used for bringing oneself to orgasm; a fake vagina
1.) "I was able to fit pictures of a nude midget, my half-naked ex-girlfriend, and 4 black guys pounding one white girl in this sweet jacksterpiece last night. My wrist STILL hurts!"
2.) "Alright, well, I'm gonna stop off at the sex toy shop and pick up a jacksterpiece on my way home. I totally ripped my last one."