Frottage

Women are often subjected to frottage on the tube, it's horrible turning round to see someone grinning and trying to pass off that he's been rubbing up against you as an accident.
 
does anyone know what tea bagging is ?

I'm not sure why you chose a frottage thread from 2004 to ask about tea bagging, but basically it's the practice of a guy dunking his genitals/balls into someone's mouth. It's often combined with face-sitting. Oh, and it feels terrific... almost as good as frottage!!