Very similar to the "Upper Decker" an Uptown is when you take a crap AND a piss in the top tank of said toilet. Use with caution.
When the victim uses the toilet next, they will flush and the toilet water will be turned a nasty yellowy-brown
(Make sure to wiggle the toilet first because you do not want to fall over)
Tom: Dude this party sucks!
Joe: Yeah man, I think I might go take an Uptown in this dudes toilet
Tom: Hell yeah!
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