look up any word, like blumpkin:
 
1.
nipple sex is better than butt sex. it is so good you die after you have it so nobody knows exactly how good it is...
You talk to john lately? Naw man, I heard he had some nipple sex. Damn thats awesome...
by mryumyums March 24, 2011
 
2.
when nipples collide
Foot ball player: OH Yeah! I GOT A TD

Foot ball player 2: YES! COME ON DUDE Chest BUMP!!!"
and then there nipples touched thus creating nipple sex
by jimmy jew jew April 09, 2011