cascapajas
A wanker or chronic masturbator. In Spain, this is often used as a punchline in a rhyming trap joke where the speaker baits the victim by mentioning boxes (cajas) to set up a rhyme with the slang for masturbating (pajas).
-And the boxes? -What boxes? -The ones you climb on to jerk me off, cascapajas!
Automatically translated from Spanish