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3.
A friend who farts with you while you fart.
1: Fart!
2: Fart!
1: Oh 2! You're such a fart buddy!
by Marisela July 25, 2004
 
1.
A pal who takes the blame for the fart you ripped
I let out a fart at my girlfriend's dinner party, but her dad acted as my fart buddy and took the blame.
by yo-what-is-up-my-dawg November 03, 2003
 
2.
A friend who will laugh with you when you fart, no matter how rancid the smell, while everyone else leaves the room angrily.
You're a good fart buddy Rob
by Nickya April 14, 2007