BFHS Share definition Flag Short for "Bull Frickin' Horseshit", a line said by the character Bill in the video game Left 4 Dead. Louis: "PILLZ HEER" Bill: *upon discovering that there was no pills* "BFHS U:<" BFHS by fastlane250 October 4, 2010 0 0 Get merch Get the BFHS mug. Buy Now — $32.95 See more merch
