Top Definition
An exclaimation of disbelief, awe, or alarm. Coined by Team Four Star in their Dragon Ball Z abridged series.

It references the fact that Mr. Popo is the blackest fucking character in any anime. He is like, a step beyond black.
Goku: I am strong enough to defeat anyone-- HOLY BLACK ON A POPO! WHAT WAS THAT!?
by Lord Damon November 16, 2009
6 Words related to Holy black on a Popo!

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