Four Fs may stand for: Four Fs (evolution), "fighting, fleeing, feeding, and fucking" Four Fs (legal), "fruit, fungi, flowers, and foliage" "Fight, Flight, Freeze, and Fawn" Four Fs as applied in military parlance, "find, fix, flank, and finish" Friedrich Ludwig Jahn's "frisch, fromm, fröhlich, frei" ("fresh, pious, cheerful, free")
See also 4F (disambiguation) F4 (disambiguation)