Clacker Smacker
To get hit in the genitalia, usually by an object not a body part.
(Guy Skateboarding): Hey guys check this grind!
(bails and falls on genitalia)
(Skater's Friend): Ooooh, what a clacker smacker
(bails and falls on genitalia)
(Skater's Friend): Ooooh, what a clacker smacker