a form of female masturbation where the female in question gets into a bathtub, moves underneath the running tap water so that the water runs directly over her clit until orgasm.
"my vibrator broke, good thing I went tubbing or today woulda sucked."
A method of female masturbation in which sexual pleasure and/or an orgasm is achieved by a woman who repetitively glides her clitoris over the (often lubricated with warm water) top surface of a modern-style bathtub's apron (outside portion of bathtub that can be mounted jockey-style)
The telephone's constant ringing interrupted the intimacy of the tubbing session the woman was enjoying on the edge of her bathtub.