Top definition
Adj.: When something is both unbelievable and ridiculous at the same time, whether good, bad, or otherwise.

Used by Neil Patrick Harris in a Twitter post.

Alternate spelling: unbelievadiculous
As much as I LOVE me my iPhone, it's unbelivadiculous how crazy often my calls get dropped.--NPH
by Fleet Sparrow January 28, 2010
Get the mug
Get a Unbelivadiculous mug for your guy José.