Green’s Dictionary of Slang

(US) a penis.

1974		(con. 1940s) E. Thompson Tattoo (1977) 91: He returned his pajawonk tenderly to the pouch of his jockeys. [Ibid.] 579: I had her puffing over my old pajonk.
1976		E. Thompson Caldo Largo (1980) 73: My old pajonk has crawled up in my belly to hide.