I. toot 1 /tuːt/ BrE AmE verb [intransitive and transitive]
[ Date: 1500-1600 ; Origin: From the sound ]
if you toot your car horn, or if it toots, it makes a short high sound:
The taxi driver was angrily tooting his horn.
A car tooted at us.
II. toot 2 BrE AmE noun [countable]
a short high sound made by a car horn