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A combination of the words sly and bilingual. It is reserved for individuals that posses a cunning ability to manipulate there first language into a second. It can be used negatively or positively depending on the surrounding sentence.
Example 1: Not only is John Edwards a lawyer and a politician, he is also slylingual.

Example 2: Jay-Z's verse on "Diamonds From Sierra Leone" is so slylingual
by Brass Palmz May 09, 2010
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