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When you pee and can't get that last 1% out due to:
A) morning erection
B) being in an area where it would be too embarrassing to fart (the fart needed to release that 1%).
C) combination of both.
Often resulting in an embarrassing urine stain on shorts, pee of our, discomfort due to wet genitalia or a combination of above.

Usually causes more net embarrassment than the necessary fart would have caused.
'The bathroom at the shop is next to the hot secretary's desk. Didn't want her to hear me fart so had to pull a 99 percenter. That's why I have that piss spot on my pants...FML!"
by Cath8r/Rob bert March 09, 2015
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