Green’s Dictionary of Slang

(US black) the penis.

[1754		Scoundrel’s Dict. 27: Born Beggars all thou dost excel, / Thy Swipestakes still shall bear the Bell, / No fireship yet abroad it fell].
a.1954		‘Ball of the Freaks’ in D. Wepman et al. Life (1976) 111: His swipe swole twice its size.
1969		‘Iceberg Slim’ Pimp 34: The prettiest one [i.e. whore] can do more with a swipe than a monkey can with a banana.
1979		‘Iceberg Slim’ Airtight Willie and Me 69: They chopped off his swipe and balls.
1983		R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].
2009		T.A. Mason Love Won’t Let Me Be Silent 114: Mr. Average does not always have a six-pack or always have 12 inches of swipe. He does not always have that chiseled body that you have fantasized about all your life.