Nipples that are so severely hard or pronounced that they would be capable of cutting glass.
Fuck, it's freezing out there. I've got glass cutters.
by aspirin June 14, 2004
When you can see the bulge of a man's package through his underwear resembling a standard glass cutting tool.
See George St. Pierre, G.S.P.

"Hey, did you see G.S.P's glass cutter when he pounded Thiago Alves?"
by Brown Nation BN July 11, 2009
when your nipples are hard from it being too cold.
"It's freezing in here, now people will see my glasscutters."
by GhostWriter2 June 07, 2005
Hard Nipples
"Damn those bitches nipples are glass cutters"
by joy1989 January 26, 2010

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