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.
de tyler0durden 27 juin 2005
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"
de Parma-lay-me 13 juin 2009