Green’s Dictionary of Slang

crank n.3

[resemblance to SE crank, a handle]

1. (orig. US) the penis.

[US]R. Price Ladies’ Man (1985) 33: All I could think about was her hand on my crank in the deli.
[US]S. King Dreamcatcher 449: Had a hell of a good crank on him, too.

2. (Aus., also hand crank) an act of masturbation performed by a woman.

[Aus]B. Moore Lex. of Cadet Lang. 99: crank a masturbation of the penis as performed by a woman. The term is a shortening of hand crank (q.v.).

In phrases

bite someone’s crank (v.)

to fellate.

J. Nichols Greenwich Village Gazette Jun. [Internet] What this dangerous crackpot is telling me after a glorious lifetime of sucking and fucking and three years of non-stop AIDS activism is that I have this disease because I want to have it. Louise Hay can bite my crank.