n. a gun; a revolver. (Underworld.) : Rocko pulled out his cannon and aimed it at Marlowe's throat.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
cannon
1400, from O.Fr. canon, from It. cannone "large tube," augmentive of L. canna (see cane). Cannon-fodder (1891) translates Ger. kanonenfutter (cf. Shakespeare's food for powder in I Hen. IV). Cannon-ball is from 1663.