Urinating in an open container while riding in a moving car. The phrase originated in 1835, when settlers riding the Oregon Trail were forced to relieve themselves in a large Stetson hat, to avoid stopping their wagons for fear of Indian attacks.
"Geez Jimmy, would you drive a little smoother? I'm filling up the stetson right now, but since you're driving like a maniac, it's splashing around everywhere."
by Ladderwalker January 27, 2009
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Get the Filling Up mug.Guy1: Dude what took you so long
Guy2: I had to fill the pool up
I filled the pool up
I'm filling up the pool
Guy2: I had to fill the pool up
I filled the pool up
I'm filling up the pool
by Ben. S April 1, 2007
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Get the Filling Up The Tank mug.by bekaleena August 20, 2010
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Get the Filling up the tank mug.When a man says that he's has blatter problems, but he's secretly going to have intense orgasms while fucking a milk jug.
by Cjrockinf August 3, 2017
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