To ride in the front passenger seat of a car. An allusion to stage coaches in the 19th-century US, which were often protected from outlaws by someone who sat wielding a shotgun next to the driver. Mom, Jake got to sit shotgun this morning—it's my turn! OK, let's get back on the road. Who wants to sit shotgun?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.