In the plumbing field a nipple is a predetermined short length of pipe usually NPT(National Pipe Thread). A NPT threaded nipple can be made of almost any material and can be in sizes ranging from 1/16" to 24" NPS(Nominal Pipe Size). The plumbing nipple gets it's nickname because of it's similar function to that of a female nipple in humans and animals. It's usually a small protrusion which emanates fluid or gas.
"You want your nipple an 1 5/8" off of the finish wall in this situation."
by JoePlumber April 14, 2010
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The process of siping or 'nursing' a drink
What are you doing over there? Stop nippling that drink and get it down.

Are you a nursing major? Stop nippling that beer and grab another
by NumberOne111 May 24, 2015
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The thing that can hurt and help.ex.
HURT: 1)If you are and a girl and you get punched there it hurts like hell. 2) If your a girl and you dont like guys you still get to see guys stare at you there.3) If yours are small then guys probly wont date you.

HELP: 1)They can help you get guys if yours are big. if your a girl then thats the only way they help.
oh my nipple is so hard I could cut glass with this bitch
by Kassandra@KJ102.7 February 17, 2011
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When a woman's nipples are extremely visible through their clothing thus indicating they are wearing a cheap bra or no bra
omg she was totally nippleing. that whore must not be wearing a bra
by brawearer August 13, 2008
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The worlds greatest friend to all. On everyone. Played with a lot. Sometimes abused. But nipples is the awesomest friend in the universe!
by Batmansweg June 8, 2014
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can be inverted, of many shapes and sizes,colors and textures, soft or wrinkley (if over the age of 60), usually attached to a mouth. can be compared to a loonie, with a raisin sitting on top. can be tweaked, rubbed, even pulled. (or pushed)
the nipples of her(his) salami titties pressed against a window p.s purple areolas with one lone hair
by cpt.n.tweak November 9, 2006
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