1 definition by Zach Lane
Occurs on a hot summers night as your balls hang low and then, when a friend or enemy falls asleep, or is heavily intoxicated, one drops their pants, swings their thighs in a thrust forward motion then drops down quickly to slap the victims face with the testicles.
That was the craziest Thunderdunk ever, his balls hit that guys face so hard I thought I heard a sonic boom!
by Zach Lane May 30, 2008