Green’s Dictionary of Slang

(S.Afr.) the penis; also used as a term of abuse.

2005		A. Lovejoy Acid Alex 79: Dates and crimes all gouged out in Afrikaans or pidgin English [...] with base comments abour poes, piel and holnaai. [Ibid.] 187: And they fucking swore. Creatively. You were Piel, Slang, Spinnekop, Troep, Penie, Perd.
2008		A. Lovejoy ‘The Smell of Tears’ at www.acidalex.com 🌐 3: Feeling his piel stirring as he brushed the cold silver metal.
2009		IOL News (Western Cape) 21 Feb. 🌐 His initial defense was [...] ‘my piel is nie so lank so daai s’n nie’ (my penis is not as long as that man’s).