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1.
1. A fart that doesn't quite make it all the way out.

2. A fart that is so explosive, after the initial release, the anus remains open briefly allowing external air to enter the rectum.

3. A fart that if it had not been muffled by a wooden bench, or 70's style fiberglass chair, would've been extremely loud rather than shaking a city block 6.9 on the Richter scale.
"Damn, that bowap made the glass explode from the windows"
by Beavis_H_Christ April 09, 2004