An adjective used to describe a smile as extremely wide and mischievous, cocky, or malevolent looking--"a Cheshirian grin". Derived from several adaptations of Lewis Carroll's Cheshire Cat character in Alice In Wonderland, including the Disney version.
As the poker player took in the pot, he flipped over an outrageous bluff with a Cheshirian smile.
by MisterLheticus November 07, 2013
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