Top Definition
The law of averages that states that sooner or later in a reason-minded discussion about the Teenage Mutant Ninja Turtles, someone will attempt to refute the entire discussion or argument with a statement equivalent to "But we're talking about four mutant ninja turtles living in a sewer!"
With no leg to stand on in the ninja turtle debate, Jerry invoked Crisler's Law.
by Kevin Laird December 23, 2011

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