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2.
When your nipples can be seen poking through clothing, often because of cold weather, sexual arousal, or particular types of clothing. Many women wearing bathing suits and sports bras tend to have a problem with this because of thin coverage, feeling uncomfortable at the prominent exposure of their body.
Are you cold? You're nipping out.
by Charmen February 06, 2010
 
1.
When you get a funnie feeling in your cat-box and/or you get COLD! your nipples go wa-boing!
Hey Ryan guess what? Ryan:"what? ....I'm cold...tee hee...
by anna and crystal June 15, 2003