When your nipples get hard.
It's cold in here, I just got a nipple boner!
by flash dance hobo May 12, 2006
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When your nipples become hard and stick out.
Tom "He i can see her nipples through her shirt."

Jim "Ya, she has a nipple boner."
by jimbo4444 July 25, 2012
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A nipple boner is usually a small foreign penile protruding from a woman's breast; Usually milky in color and it smells like shat.
Ron: Is that a little penis coming out of your nipple?

Black girl: No dick, it's my nipple boner.
by Oprah Adolf Hitler April 3, 2009
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Very "out coming" or "outward" nipples usually on males

When females get boner nipples is called nipping; when females get boner nipples it's called a nipping
Aye bro you cold you've got some boner nipples
by Random_fact_girl May 2, 2015
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