Prior to teabagging, you dip your scrotum in sugar, and then drop the now sugary-sweet package in an unsuspecting victim's mouth.
Guy 1: Oh man, that dude teabagged me last night when I was passed out drunk.
Guy 2: I'm jealous, did it taste salty?
Guy 1: It actually tasted pretty good, it was a sweet teabag.
Guy 2: You're a homo.