Potassium nitrate (KNO3), a substance used in explosives (usually gunpowder) and fertilizers.

Contrary to popular urban legend, saltpeter has no effect on libido, and too many side effects (high fever, etc.) to be used even if it did.
The army doesn't want to kill our soldiers with saltpeter. They want our enemies to do it.
by red_beard_neo April 15, 2004
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a magical formula that they put in your food in prison and possibly in the military also to curb your ability to pop a boner.
you can't even pop a chubby in basic training caue of the saltpeter
by cobud March 14, 2004
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A Viagra & Saltpeter-gasm is the orgasm a guy has after he eats food laced with Viagra and Saltpeter -- he has cumgasms and shits his pants simultaneously.
Aww man ... somebody put Viagra and Saltpeter in our food, and I had a Viagra & Saltpeter-gasm -- I was cumming and going at the same time!
by USAF Cadet January 31, 2021
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