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2.
The act of someone pinching/squeezing the area right below the shoulder blade, and twisting in a clockwise/counter-clockwise motion. Depending on your quickness and the pain you conflict, you may have anywhere from 2-12 seconds to squeeze and twist.
Guy1: Where were you yesterday?

Guy2: I was getting replaceable surgery for my back nipple.

Guy1: I'm so glad I'm not you.
by TheMrNomanners September 23, 2011
 
1.
The two bumps created by a girl's bra strap on her back.
Her back nipples smelled of butter
by Yeggypan McDormand June 14, 2008
 
3.
A nipple cripple to the fat on a persons back.
Widely believed to be more painful then the original Nipple cripple.
Try this one out on small kids and fat bullys. However it is best not to cripple on the nipple but above it is the target.
"Ahh shit that back nipple hurts one in the back kanes bruv"

"That was the hardest Bak nipple in the motha fuckin hizzy"
by Sam A mosely May 19, 2005