The act of tricking someone into an unfortunate experience involving ejaculate.
I thought I was spreading mayo onto my turkey sandwich, but it turned out to be cum!!! Damnit Shandy, another successful jizz-trap!
1. Female whom enjoys having jizz in her trap.
see also: cumslut; Jenna Jameson.
Man that bitch i took out was one hell of a jizz-trap!!!!