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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
 
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