UnTruthitude 

the act of being false/fake
a falsity

Liars tell the best untruthitudes

UnTruthitude by B. November 15, 2003

Untruthitude 

A lie.

Michelle: I'm the sexiest person in the world.
Dan: Untruthitude. That would be me.

Untruthitude by Katiee Drew November 22, 2009

untruthatude 

A lie. To speak falsley.
(see also Falcity)

Uh uh, ya honor, that's an untruthatude. I was nowhere in the area when that lady got mugged.

untruthatude by Greg February 10, 2004