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.
by Mowgli9999 January 21, 2018
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When your nipples harden.
Friend 1: "Man, your nipples are hard, what should we call that?"

Friend 2: "We should call that nipple peaking".
by Daddy Penguin July 1, 2016
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