the act of deficating in the water tank of someones restroom, so when they flush, out comes muddy madness
i just left an upper decker in that starbucks bathroom!
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take a shit in the top of someones toilet (where all the toilet guts are)
Valerie was so drunk she did an upper decker in her friends toilet at the party, and everyone smelt it.
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A long home run ball hit into the upper seats of a baseball stadium.
After I caught an upper decker at Busch Stadium, I went to Dan's house where I left a beefy sewer pickle in the tank of his toilet.
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To take a shit in the top of the toilet, therefore when the toilet is flushed, brown water washes the poop down.
"That fuckin bitch wouldn't blow me so I am going to leave her an upper decker"
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the act of pooping, in th top resiviour part some someone elses toilet.
I just gave Bills toilet an upper decker.
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When you have a massive deuce that must come out when your at a big party. You remove the top lid to the toilet, and release all the poo into it. When done, put the lid back on, and walk out like nothing happened.
I just put an upper decker in her toilet, HAHA!
There gonna be lookin for that upper decker for weeks,HAHA!
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A modification on the "classic" upper decker. In a public toilet setting (where there are no tanks/commodes), you improvise and shit in the urinal.
When Hank got fired from his job, he pulled an upper decker in the company bathroom.
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