Top Definition
verb.

Coming from the historical chant "99 bottles of beer on the wall", used to describe one that has held there "urine" in ones bladder for a long period of time.

One that has to urinate (very badly).
"I gotta piss so bad, I'll be fillin' 99!"

"Stop here. I gotta fill 99."
by Miss Star August 03, 2007

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