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1.
A physical nipple reaction caused by cold weather or sexual excitement. A german word meaning "nipple weather", originating from when girls in Germany would come out of a steamy disco into the cold weather and their nipples would get hard.
man to another man after seeing a girl with hard nipples: "Hey today is Nippelwetter"

or

woman to another woman with hard nipples: "hey you have nippelwetter"
by Orbitohnezucker July 20, 2009