1. A term of endearment for someone you like but who is acting like a butt-head, a doofus, a moron, an ass-wipe, a douche bag.
2. LITERAL; A nipple, male or female, covered in male reproductive fluids.
1. "Hey jizz nipple, are you gonna drink that last beer or just keep spilling it on my couch?"
2. "She was so hott that i gave her a jizz nipple!"