cry of a goose, 1814, American English, imitative. As a verb by 1854, of geese; the sense of "sound a horn," especially on an automobile, first recorded 1895 in American English. Related: Honked; honking.
Slang definitions & phrases for honk
honk
verb
To sound the horn of a car (1895+)
To make a sexual, esp a homosexual, advance by handling or pressing a man's genitals: He's making a move to honk you, just grab his hand(1960s+)