WHOOP, noun Hoop. [ This is the same as hoop, but aspirated. The sense is to drive out the voice.]

1. A shout of pursuit.

2. A shout of war; a particular cry of troops when they rush to the attack. The Indians of America are remarkable for their war whoop

3. The bird called hoopoe or upupa.

WHOOP, verb intransitive To shout with a particular voice.

WHOOP, verb transitive To insult with shouts.