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When a girl is sitting down to piss and a dude stands in front of her and also pisses. While he is peeing his piss stream merges into her piss stream creating a "dual fountain" aka a downtain.
The line to the men's room was ridiculous so I went into the girls bathroom and made a downtain with this drunk chick!
by sorryimnotsorry June 22, 2011
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