A song with an extreme amount of bass. The vibrations are so intense that you can feel it deep deep inside your rectum. Also known as a real ass pounder.
Clark - "Yo Ted, have you heard that new song by Daft Punk?"
Ted - "Yea bro, its A Real Butt Fucker, we should totally play it at our kegger this friday. We're gonna get so much pussy!"
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.