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1.
Nipples facing in-ward
My nipples after kinky sex with multiple guys
by Shaun Coffin April 21, 2003
 
2.
A somewhat rare condition in males and females in which the nipples have soft/puffy aureolae and an in-turned nip. They can, however, be extroverted temporarily when aroused.

It is rumored that inverted nipples are more sensitive than normal nipples.
(o) Normal nipples. (o)

(-) Inverted nipples. (-)
by KtWdA November 08, 2012
 
3.
used to describe what happens when it's too cold outside.
from looking at it... when your nipples get sucked back into your chest.
by Tasha January 13, 2004
 
4.
when someone be so fat that the tips of the nipples go in instead of out

what dan has
dan has inverted nipples on his titties
by Anonymous April 02, 2003