Holy crud Share definition Flag An exclamation used in a suprising situation, usually with negative circumstances for the speaker. "Thank goodness, those clowns almost got me--HOLY CRUD THEY'RE STILL HERE!" --Billy, "The Grim Adventures of Billy and Mandy" Holy crud by Kazyan September 30, 2006 0 0 Get merch Get the Holy crud mug. Buy Now — $32.95 See more merch