When one eye closes more than the other.
In referancde to Big Black of Rob and Big whos left eye closes more than the right.
<a href="http://media.photobucket.com/image/big%20black/klvillarreal/Dalton/bigblack-1.gif?o=13" target="_blank"><img src="http://i280.photobucket.com/albums/kk171/klvillarreal/Dalton/bigblack-1.gif"></a>
When hes smiles he totally has a big black eye.
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