fadahshi Share definition Flag a slur of the words. "Fuck", "That", and "Shit". Commonly used when some one is enraged by a certian event. Teacher: And tommorow we are having a test- Student in back: FADAHSHI!!! fadahshi by sean smitty June 20, 2008 0 0 Get merch Get the fadahshi mug. Buy Now — $32.95 See more merch