“Dimitrov skins Moran - deliberately flying to collide there - and it’s got to be another penalty - yes, there’s the whistle!”
-- Ludo Bagman, during the final of the 1994 Quidditch World Cup (GF8)
The Quidditch foul of flying to deliberately collide with another player.
The English word "skinning" usually refers to removing the hide or skin of a dead creature. In Muggle football (US 'soccer'), "skinning" refers to one player taking the football away from an opposing side's player - or beating them to the ball - using superior speed and ball control skills.