8fy Share definition Flag Slang term for an “Eighth” or “8th” of Marijuana. Yo my plug just hooked me up with an 8fy for $30, it kinda looks like reggie tho. 8fy by Ben_420 April 21, 2021 0 0 Get merch Get the 8fy mug. Buy Now — $32.95 See more merch