nipple-share 

The act of a mother breastfeeding another mother's offspring

Mother 1: Would you like to nipple-share?
Mother 2: Sure, I'll give you my baby to breastfeed and you give me yours to breastfeed.
Mother 1: Great, let's be nipple-sharers!

nipple-share by CazzaZell June 19, 2013

Nippleshake 

The act of greeting someone by gently squeezing (and hence exciting, and possibly putting a smile on) their nipple. Usually followed by a wink. Not recommended for greeting someone of the opposite gender, but results do vary.

Every time I see Billy, he nippleshakes me but I never get the time to do it back because I would lose all my senses for a couple of seconds.

James tried to nippleshake that girl he had a crush on. He thought it would have a similar effect to when I do it to him. He was wrong. Now he has a bruise on his right cheek to tell the story.

Nippleshake by abey-baby April 17, 2010

NipplesHardBecauseItsColdiosis 

The side affect of having your nipples become hard due to the cold

Damn girl are you cold, because you have some severe NipplesHardBecauseItsColdiosis going on

NipplesHardBecauseItsColdiosis by Perpendicular Cylinder October 19, 2019