Meaning of “hoot” - Learner’s Dictionary

hoot

verb uk us /huːt/
CAR [ I, T ] mainly UK

to make a short sound with your car's horn (= part you press to make a warning noise) :

The van driver hooted his horn impatiently.
BIRD [ I ]

If an owl (= bird that hunts animals at night) hoots, it makes a low 'oo' sound.

hoot with laughter

to laugh a lot very loudly

(Definition of “hoot verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)