Insulting tense: Cockslammer, as common with many other terms such as “Faggot” and “Queer,” can be used as insulting terms of address for people who are stupid, irritating or otherwise pompous. It is, in fact, most commonly used this way.
Mobius: Dudes, did you hear? Stealth is actually gay!
Shaft: That doesn’t come as a surprise.
Glenn: Really? Hah, I always knew that prick was a cockslammer.
Glenn: That guy Bill got his ass kicked at school yesterday.
Mobius: Really? It’s about fucking time.
Glenn: Yeah, I’ve always hated that cockslammer.
Mobius: Let me have some of your Cheetos, Soup.
Soup: Fuck you; get your own.
Mobius: Why do you have to be such a cockslammer, Soup?