Hoot  —n. 1 owl's cry. 2 sound made by a car's horn etc. 3 shout expressing scorn or disapproval. 4 colloq. A laughter. B cause of this. 5 (also two hoots) slang anything at all, in the slightest degree (don't care a hoot; doesn't matter two hoots). —v. 1 utter or make hoot(s). 2 greet or drive away with scornful hoots. 3 sound (a car horn etc.). [imitative]