To bang a girl in the ass while yelling ruff-caw ruff-caw
To go to a national park and eagle watch while fucking a one legged whore in the wilderness
To lay a ho on the bed with her legs spread and climb on top of a bookcase or shelf and proceed to jump while yelling ruff caw head first into a big fat pussy

A casual invitation / threat used by an individual that is not afraid of fucking someone up.