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A person or situation that is wild, crazy or just plain unbelievable, a situation or person that you don’t really like or can’t trust, utter chaos, stupidity
Luke forgot to bring his wallet on the first date and did it on purpose Claire could sense this so she told her cousin he was a rat show.

There was a lot of traffic merging wildly, what a rat show !!
by Clairebonnie January 12, 2018
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