That which howls, especially an animal such as a wolf or a howler monkey.

(historical) A person hired to howl in mourning at a funeral.

(slang) A painfully obvious mistake.

(slang) A hilarious joke.

(slang) A bitterly cold day.

(psychology) A person who expresses aggression openly in the form of threats.

(sometimes figurative) A heavy fall.

(slang) A serious accident (especially to come a howler or go a howler; compare come a cropper).

(slang) A tremendous lie; a whopper.

(historical) A 32-ounce ceramic, plastic, or stainless steel jug used to transport draft beer.

(slang) A small child.