A phrase used to replace 'Thats what she said'. It is in reference to the pundit Andy Gray who made sexist comments about a female lineswoman in a premier league soccer match.
Mike Whats the answer to this question?
John: I don't know what it is.
Mike: Thats what Andy Gray said!

or
Frank: Whats going on?
Sam: Thats what Andy Gray said!
by yeahyeahkid February 1, 2011
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