hangin around

The famous words uttered by beetle juice himself

Hangin is rhyming slang for cock. Hanging rock is your cock, so you call it a Hangin

The preferred casual way to write “how is it hanging” which in is a colloquial phrase meaning generally the same thing as “how are you doing?” or “how is it going?”. There is a loose reference to male genitalia being made when one says this phrase, however the reference is relatively unimportant to the actual meaning.

just like walkin the dog in public