look up any word, like bukkake:
Pantsy jaculation is where you blow your wad in your pants.

Can be quite embarrassing in social situations.
When Rolf saw Sandra's perfect nipples pressing against her shirt, he let out a low moan, and a wet stain appeared on the front of his pants.

"Did you just have a pantsy jaculation?" asked Danny.

"Yes!" sobbed Rolf, slinking for the exit.
by scodder May 03, 2010