1) A very annoying person who invades everyone's space, usually is a little pissant with no friends. Or-
2)A person obsessed with the sexual anatomy. Usually get their asses handed to them on a regular basis.
Stacy: Get the FUCK away from me! (runs off)
Paul: Good goin', Captain Perversion, you just creeped her out AND invaded her space at the same time. Way to go.
Stan: Fuck off, Paul.