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1.
A fart. The result of passing wind. A silent, but deadly one.
All of a sudden there was a foul odor from the back seat of the car. Uncle Joe turned around and asked, "OK, WHO made the boompser?"
by Coconut Head in Space May 28, 2005
 
2.
a sneaky, silent but deadly, little fart
P U. Do you smell something?? OK!!WHO made the boompser???
by Coconut Head in Space May 30, 2005