when you go beyond a normal erection and your penis has hardness of stone.
i had major rock cock after walking in on your mom in the shower.
ayon kay tyler0durden ika-27 ng Hunyo, 2005
2 more definitions
After a concert when a girl gets layed by a rock band member, preferabley on the bands bus.
"That lead singer is hot as hell, I'm getting me some ROCKCOCK tonight"
ayon kay Parma-lay-me ika-13 ng Hunyo, 2009
your cock rubs against small to large jagged rocks thus producing a reddish inflammed penis.
The water is low today for tubing I hope i dont get rock cock on the rapids.
ayon kay meaty petey ika-12 ng Hunyo, 2011