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1.
A poop someone has taken on the lid of a toilet. A higher level punishment than even an upper decker, as it leaves the poop exposed to the air and must be dealt with before the toilet is used in any capacity.
Somebody is going to have to deal with the upstairs bathroom. Some asshole took a mezzanine on it during the party last night.

Glenn Beck was outraged to discover one of his dinner party guests had left a mezzanine in his bathroom.
by HamsterDouchebag December 29, 2010
 
2.
Pooping in between someone's mattress and box spring, leaving them a nice surprise while they sleep.
While Aaron was out at work, his roommate decided to mezzanine him for all the dirty dishes he left in the sink.
by the GRim REAPERS October 18, 2009