The text plays on the juxtaposition of 'honk', which is a sound made by a car horn, typically used to signal or alert, and 'obscene gestures', which are non-verbal forms of communication often considered rude or offensive. The humor arises from the irony of using a standard, socially acceptable signal (honking) to express affection for something socially unacceptable (obscene gestures). However, it does not exploit different meanings of a word or similar-sounding words.
Honk if you love obscene gestures .