Green’s Dictionary of Slang

yang n.

[var. on wang n.2 ]

1. the penis.

[US]Guild Dict. Homosexual Terms 35: Penis [...] yang.
[US]B. Rodgers Queens’ Vernacular.
[US]Playboy Feb. n.p.: The pet name for his yang (Enormous Heat-Seeking Moisture Missile, [etc.]) and for her love glove (Alice, Gertrude and One Size Fits All) [HDAS].

2. (US black) nonsense.

[US]J. Hannaham Didn’t Nobody Give a Shit 218: Always talking some yang about all the wives he already had.

In phrases