What is Biffing Plate?
1.
The area of a chick's ass that a male's Jackson Pollocks hit off when he bangs her
I sat down on my sandwich.
Now it's flatter than Jenna's biffing plate.
2.
The small area of skin between a woman's cunt and asshole where a guy's balls slap against when he is fucking her
Boy, Mary's biffing plate got a good hammering last night
See 
Random Words:
1. 
Term used for avoiding unwanted responsibility in a group setting.
Chris: "We're outta beer... Who's going to the store?..