Cocksucker

People say that there's no male equivalent to the word 'bitch'. It's a double edge sword; both fighting words and a compliment - often said in passing and often cause for a long meeting with human resources.

I submit; cocksucker. An easy fight picker, but an easy way to get a laugh, as well.
The term can refer to a crafty negotiate or a rat-bastard, depending on inflection.

Try it. Carefully.