a buddy that you goon with. At the surface level, it's a male friend that you have over to jerk off and edge to porn for hours with. However, goon buds often develop into much more, with the porn addiction rotting the gooners' brains until they feel the desire to act out the acts they've watched on each other.
I'm having my goon bud over and we're going to goon all night long!
I sat on my goon bud's dick and rode it until it destroyed my brain.