Hootenberry

A word which is simultaneously a noun, verb and an adjective. This word is used in reply to something you did not find funny at all but must pretend you did because you are extremely obnoxious, preferably said with a deadpan face. Users of this word are generally extremely unfunny.

Person 1: I cannot go through with this engagement, you are slowly killing yourself and I am breaking up with you

Person 2: Thats a hootenberry