to cry out or shout, esp. in disapproval or derision.

to utter the cry characteristic of an owl.

to utter a similar sound.

Chiefly British . to blow a horn or whistle; toot.

to assail with shouts of disapproval or derision

The fans hooted the umpire.

to drive out, off, or away by hooting.

to express in hoots

The crowd hooted its disagreement with the speaker.

the cry of an owl.

any similar sound, as an inarticulate shout.

a cry or shout, esp. of disapproval or derision.

British . a horn, siren, or whistle, esp. a factory whistle.

Informal . the least bit of concern, interest, or thought; trifle

I don't give a hoot.

Slang . an extremely funny person, situation, or event

Your mother's a hoot when she tells about her escapades in boarding school.