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The physiologial change to a woman's nipples whenever they're cold and/or arroused.

Most visible on women with tight upper torso garments while not wearing a bra.
Man, did you see her nerection?!

Famous nerection celebrity: Victoria Beckham.
by Mad Men OA June 17, 2008
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2
A nerection is an erection of a man or woman's nipples that can happen when cold or horny
Teenage Boy #1: Hey did you see Veronica Mars on TV? She had a sexy nerection!
Teenage Boy #2: No but I saw Tina Heron's nerection on PornHub.
by GEN_Cody January 15, 2016
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