Nipple peaks
When something intrigues you so much one’s nipples harden.
Oh my gosh, I just got nipple peaks watching that movie, it was so cool.
Nipple peaking
When your nipples harden.
Friend 1: "Man, your nipples are hard, what should we call that?"
Friend 2: "We should call that nipple peaking".
Friend 2: "We should call that nipple peaking".