one who in completely unchill, acting stupid, or is ignorant to the subject your are talking about.

in comparison to when a black man says "yo, nigga"
Yo, foolstyle is you thinkin straight?
Yo, Tom is a straight up foolstyle.
Yo, how many fools does it take to screw in a light bulb?
Yo, you chillin foolstyle
by brooklyn4life October 11, 2010

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