Happens after playing with yourself (aka whacking off) and not cleaning up properly with a tissue. After around 10 minutes your member becomes stuck to your underwear because of the excess semen excreted from your cock.
Dude, I had this awesome wank earlier, but 10 minutes later I had a willy dribble, now i need lubricant to get my boxers off.
by Rob & Queen April 03, 2005
The process of not finishing off properly, and dribbling piss down one's leg, boxers or sometimes into the shoe, depending upon how relaxed one is. Condition worsens under the influence of alcohol.
"Jack mate, Ive dribbled ! No ! Willy dribble !"
by masterdribbler2 May 18, 2009