guaran-fucken-tee Share definition Flag A word used to express complete assurance. Often used in arguments and in dangerous situations. I guaran-fucken-tee you that if the red button is depressed we are all screwed. guaran-fucken-tee by the_inexistent_pilgrim November 18, 2005 0 0 Get merch Get the guaran-fucken-tee mug. Buy Now — $32.95 See more merch