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rock tits 

When someone's nipples become hard and pointy either because they are cold or because, in a girl, they are aroused.
Bethany's rock tits were a clear indication that it was getting cold out side.
rock tits by Jaymz T July 10, 2007

Rock Tits 

When a person (typically a bro) is worked up and needs to calm down. See also Chill yo tits.
Dude, you need to heat your rock tits. I was kidding you bitch.
Rock Tits by themaninblack12345 December 2, 2011