Green’s Dictionary of Slang

1. the penis.

1781		Belle’s Stratagem 24: Show me tghe amorous hero that will charge with love’s fix’d bayonet [...] led on by the gallant General Cupid.
1798		‘Toy’ in Hilaria 95: Nell chambermaid next crept up stairs, / Saw the ensign on a table, / The captain charging ’twixt his legs, / With bayonet so able.
1836		‘The Soldier’s Bayonet’ in Gentleman’s Private Songster in Spedding & Watt (eds) Bawdy Songbooks (2011) III 368: Then they lay me on the ground, / And thrust me through and through, / The soldier with his bayonet, / About twelve inches long.
1890–1904		Farmer & Henley Sl. and Its Analogues.
1896		Farmer Vocabula Amatoria (1966) 17: Arme, f. 1. The penis; ‘the bayonet’.
1930		Razaf & Williams ‘My Man O’ War’ 🎵 I got myself a military man / [...] / He storms my trench and he’s not afraid / His bayonet makes me cry for aid.
1969		J. Hibberd Dimboola (2000) 95: mutton: They don’t call me Mutton Gun for nothing. bayonet: And me, Bayonet. mutton: Master of the pork sword.
1990		(con. c.1970) G. Hasford Phantom Blooper 13: Inside the only guard bunker still standing in our area, our New Guy is busy choking his lizard [...] polishing his bayonet, just a little early-morning organ practice to cut the edge off the cold.

2. (US drugs) a hypodermic syringe or needle.

1959

J.E. Schmidt Narcotics Lingo and Lore.