Definition from Wiktionary, the free dictionary
See also: slapback
slap-back (plural slap-backs)
- (sports, aerial freestyle skiing) a faulty landing, whereby the skier rotates backwards around the knee-joint and hits the snow of the landing slope with their back and head, before rising off the snow back into position with their skis underneath them.
- (freestyle aerial skiing): rudy, randy, daffy, full, double-full, triple-full, lay, back, hurricane, stretch