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when your nipples are hard from it being too cold.
"It's freezing in here, now people will see my glasscutters."
de GhostWriter2 7 juin 2005
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.
de aspirin 14 juin 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?"
de Brown Nation BN 11 juillet 2009
Hard Nipples
"Damn those bitches nipples are glass cutters"
de joy1989 26 janvier 2010