What is the meaning of Howler?

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

A person hired to howl in mourning at a funeral.

A painfully obvious mistake.

A hilarious joke.

A bitterly cold day.

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

A heavy fall.

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

A tremendous lie; a whopper.

A fashionably but extravagantly overdressed man, a "howling swell".

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

A small child.

Source: wiktionary.org