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1.
1.) A can of crap is a bad, troubling situation arising when a decision or action and produces considerable subsequent problems. If you open a can of crap, you do something that will cause a lot of problems and is probably going to cause more trouble.

2.) A can that is full of crap.

Yeah Frank, I was at the meeting when they read the financial statement, and Frank, if they ever find out we capitalized a loss, it's going to open up a can of crap.
by jeffbo April 10, 2009