1)A dude who consantly talks about or refers to sexual acts or encounters. 2)A dude who thinks he is unmatched in his sexual prowess. 3) A dude who thinks any woman is fair game sexually.
Ted: Did you meet Stephan at the party last night?
James: Yeah man, that dude is something else. All he talked about was how he'd like to suck on this girls tits or screw that one in the ass. He propostioned nearly every chick at the party and even copped a few feels.