When you have an orgy with alternate reality versions of yourself.

A dopplegangbanger is a porn star that closely resembles you or someone you know.

Upon encountering your double or lookalike, you proceed to fuck it.

An appropriate action to take after someone tells you to "Go fuck yourself"

A gang bang that looks, sounds, smells, tastes and feels just like the last one.

When you have an orgy with people that look like yourself

A dopplegangbanger is a pornstar who looks like a celebrity