look up any word, like bias:
 
1.
Ridiculously unattractive fake boobs; breast implants looking as though ready to pop if touched.
Chris suffered a fractured penis while attempting to screw Michelle's rock tits.

Mike chipped a touch on Carrie's rock tits during foreplay.
by Charles Campbell August 08, 2005
 
2.
Rock tit is what happens to your nipples when they get cold, or in some cases, when one gets horny. Rock tit is characterized by a sudden hardening of the nipples, hence the name.
More "severe" cases of rock tit, where ones nipples are so hard they could shatter bones, is named "Diamond tit".
Joe: Dude, you should have put on a better shirt for today.
Hal: Why's that?
Joe: It's cold out and I can see your rock tit.
Hal: Aww shit!
Joe: Attractive.
by LordFishstcks June 20, 2007
 
3.
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.
by Jaymz T June 13, 2007
 
4.
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.
by themaninblack12345 November 29, 2011