An exhaust mod that exceeds 3 inches in diameter. Frequently used by ricers
lol look at that ricer with a huge fartbucket! i bet it gives his car 20 more horsepower!
A car (usually import, more recently domestic) which has no performance modifications to it except a high flow exhaust system that when the driver steps on the gas, makes a sound like you're farting into a bucket.
"Pbbbbbbbbbbbbbbbbbbbbbbbwbwbwbwbwbwbwbwbwbwbbb", said the Honda Civic
"Look at all these high school kids driving around in their fartbuckets."