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1.
50s term for necking in the car.
Also appears in Big D and the Kids Table song "Noise Complaint"
"We were hanging out in the back of the van."
"What were you doing?"
"Just playing backseat bingo"
by simplyjam March 21, 2007
 
2.
When you and your better half make out or more in the back seat of a vehicle
Girl: Would you like to play back seat bingo tonight by the lake?

Guy:Heck yea!!!! I just got the back seat, of my whip, reupholstered.
by daddybigbuks September 11, 2009