Green’s Dictionary of Slang

1. a large penis.

1972		B. Rodgers Queens’ Vernacular 211: large cock [...] honker.
1978		L. Kramer Faggots 320: Front porch, gadget, hammer, honker.

2. (US) in pl., the female breasts, esp. if large.

2002		J. Franzen Corrections 287: All those pubescent chickies with their honkers exposed? Jail ’em!
2006		‘Bobbie Bazooms’ Office Slut 🌐 These are the words to call your boobs from now on [...] Tits, titties, boobs, boobies [...] Knockers, melons, jugs, jamambos [...] Hooters, headlights, honkers.