look up any word, like ratchet:
 
1.
When you don't pass the car in front of you for the sole reason of if there happens to be large wildlife on the road (deer, elk, moose, etc) he collides with it and not you.
Passenger: "Why aren't you passing him? He's only going 50."
Driver: "He's my deer buffer."
by Valencebyte November 22, 2010