When someone makes up a silly little definition you tell them that they are talking utter nonsense.
Strangley enough, the majority of definitions on Urban Dicitionary fall into that category.
Have you seen Urban Word of the Day? Its Stanky Leg.
Stanky Leg - what on earch is that?
I know!!! Utter Nonsense
just won't go to sleep that night as a result, probably bang the brains out of his girlfriend too... just utter madness
Someone who is beyond the point of being simply a clown, but below the point of becoming the entire circus. Those that are deemed an "utter clown" are themselves close to becoming a place of entertainment known as a circus.
Ace, you are an utter clown. Another silly move like that and you might just become the entire circus.
Stuff that is crazy ass shiznit!
That crash was utter chalice!
Talking nothing but pure drivel, being wrong. (1)
Also, you can use it when calling bullshit on a game or something. (2)
(1) You're talking utter pish!
(2) That's utter pish, sparks were flying off his head. He's well died!