Someone who is in trouble with the law (usually for drugs) so to get out of trouble he/she tells on somebody else.

The silent half of the Penn & Teller duo.

He was born Raymond Joseph Teller and legally changed his name to just "Teller". He is a mute magician who has worked with Penn Jillette for most of his life. He's been in shows such as "Penn & Teller: Bullshit!" and "Penn & Teller Tell a Lie." Teller performs six days a week at the Rio All Suite Hotel and Casino in Las Vegas.