upper tanker 

Taking a shit in the upper tank of a toilet. Also known as "2000 Flushes Brown" and "The Gift That Keeps On Giving"

The people at that fondue party were such fuckin' pricks that I had no choice but to give 'em the old upper tanker.

upper tanker by montez May 8, 2003

upper tanker 

What idiots call the "upper decker".

Idiot: I gave that ho an upper tanker!

Some Guy Who Knows His Shit: You mean an upper decker?

Idiot: Yeah, whatever.

upper tanker by MePoop May 15, 2006