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1.
If someone has beaten you in saying "Shotgun" for the drivers seat, you can say this, meaning that you can sit on the shotgun's lap.(unless the person likes to have other people sit on their lap((Freak!)) then thy should get up)
From RvB

Simmons: Shotgun!
Griff:{only seconds behind} Shotgun....Fuck!
Donut: Shotgun's Lap!
Simmons: fuck!
by Secret Justin January 29, 2007

Words related to Shotgun's Lap

frontseat lapping lap sitter lap sitting shotgun
 
2.
shotgun slap is when you steal something off someone who says i call shotgun.
driver: lets go for a ride
passenger1: I call shotgun

passenger2: Shotgun slap
by stupidflame April 04, 2011