It's when you cum in your hand and slap your partners ass. It is a loving gesture between two consenting adults.
It's also a great word to help you win Scrabble (as seen and defined in the liamkylesullivan video "Dirty Scrabble")
"Dude, I heard you and the freaky chick Martha went out last night"
"Yeah man, and when we got back to my place, I jismslaped her, like a boss"
"You're the man, bro!"
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