It's cold in here, I just got a nipple boner!
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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."
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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.
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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