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Noun: The act of having nipples that encompass the entire surface area of your tits.
Kevin: Bro, I was hooking up with some chick last night and I took off her bra and she had niptits!

Sam: Sucks bro
by Niptits lover June 23, 2011
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The temperature in which you are fucking freezing...and at times the nipples tend to hurt and expand....often times visible through the T-Shirt.
by aPiZzLe October 14, 2007
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