2. An interjection not listed in the English books. It makes the sentence stand out better, and leaves subjects that hear it with the "what the fuck/wtf?!" feeling. See holy flaming tennis balls batman for another great interjection. It is commonly subsituted for Wow! or Oh my god! or Holy Shit!
Guy 1: Wow! That house is on fire!
Guy 2: HOLY TACO! THAT HOUSE IS ON FIRE!
Guy 1: What the hell?!