Top Definition
when a person is wearing an unsupportive bra or no bra at all and they get hard nipples. Their nipples show through their shirts also.
When it gets cold, everyone is nippin out!
by Shag me 2 dope January 14, 2008
1 more definition
When you are high off cat nip, or any cat nip related product.
Dude that cat is nippin' out!
by Nipps Alot June 11, 2011

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