Tumbersault

A running dive into a summersault, or forward roll. May also be completed rolling sideways on ones back.

The boy was seen doing a tumbersault in the middle of the road to escape the police.

by ioinfodinfd February 28, 2010

tumbersaulting

A confusing and dizzying combination of tumbling and somersaulting while one is in mid air, usually a result of a botched high dive.

"Those guys look ridiculous, tumbersaulting through the air like that"

by steve8311 May 27, 2009