buttcheck

Etymology
.

Noun

 * 1)  The act of putting one's behind down to check a fall, while staying sliding along the snow on the snowboard.

Verb

 * 1)  To put one's behind down to check a fall, while staying sliding along the snow on the snowboard.

Usage notes

 * If the snowboard leaves the snow or is no longer sliding while the butt is on the snow, it is a fall and not a buttcheck.