whoop

Concise Oxford English Dictionary © 2008 Oxford University Press:
whoop /huːp, wuːp/

▶noun

• 1 a loud cry of joy or excitement.

• 2 a long rasping indrawn breath.

• 3 (in motorcycling or cycling) a bump or dip on an off-road track.

▶verb give or make a whoop.

– phrases
whoop it up informal enjoy oneself or celebrate unrestrainedly.

– origin ME: prob. imitative.