When your biking and your front tire rubs up against the person in front of you's back tire causing a sound similar to a fart.
Haha! Did you hear that tire fart?
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AKA BTF. Toxic and Smokey. Bad for the environment. Banned in 48 states including Costa Rica and Puerto Rico
Brad's Burnt tire fart was so bad he had to use mouthwash to get the taste out of his own mouth.