Ok super curious now. I'm guessing "honk" means something else in your dialect? I tried the usual "British English to American English" searches and got nothing.
In American English, "Honk" is an onomatopoeia of the sound car horns make (comparing them to the sound geese make). "To honk" is the verbing of that word. One honks a horn by pushing the center of the steering wheel causing the car horn to make the honk sound. This is done to alert other drivers, get their attention, or express road rage.