Definition of howlers:
(n) :
That which howls, especially an animal such as a wolf or a howler monkey.
(n) :
(slang) A painfully obvious mistake.
(n) :
(slang) A serious accident (especially to come a howler or go a howler; compare come a cropper).
(n) :
(slang) A hilarious joke.
(n) :
(psychology) A person who expresses aggression openly in the form of threats.
(n) :
(slang) A tremendous lie (especially an obvious one); a whopper.