Usually a penis that can drive into people or objects with as much force as a hammer. It can be used in multiple ways like the word fuck, and is more cool when you type it in all caps.
That guy is a real Cockhammer in bed
This lecture is such a Cockhammer
John "COCKHAMMER" Smith gets so many women, to bad they are all dwarfs.
1. A person who who does nothing but bitches and pisses you off to the point of it being like smashing your cock...with a hammer.
1. GODDAMMIT BERNICE YOUR BEING A TOTAL COCKHAMMER RIGHT NOW!!!