backseat changeup
A backseat changeup is what happens after a double date when you're all so drunk you get into the wrong car's back seat and fuck some dope you don't even know.
Example:
Jeff) Oh hey Bill, how did you and Caron like our double date last night?
Bill) I thought it was a lot of fun, I'm concerned that I pulled a backseat changeup with Betty though.
Jeff)
Jeff) Oh hey Bill, how did you and Caron like our double date last night?
Bill) I thought it was a lot of fun, I'm concerned that I pulled a backseat changeup with Betty though.
Jeff)