Cock1  —n. 1 male bird, esp. Of the domestic fowl. 2 slang (as a form of address) friend; fellow. 3 coarse slang penis. 4 slang nonsense. 5 a firing lever in a gun, raised to be released by the trigger. B cocked position of this. 6 tap or valve controlling flow. —v. 1 raise or make upright or erect. 2 turn or move (the eye or ear) attentively or knowingly.