Slurping Schlong
Committing the act of fellatio on a human male. While it can be used to mean sucking the penis of a single male sex partner it is usually used pejoratively to describe someone of sexually promiscuous behavior.
Ted: Did you hear that your sister was totally slurping schlong at that party last night!
Bob: Dude that's my sister!
Bob: Dude that's my sister!