The opposite of being street-smart.

Thinks talking about doing drugs makes them cooler, when they actually have barely done any.

Very loudmouthed about illegal activities or not experienced in the ways of chilling.

Excessive party fouls could be a sign of one.
Josh, only ever talking about drugs in math, is a street-tard.
by DreadedPanda13 May 14, 2011
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A person who does not have the brain capacity for common sense but is still good at school.
Hey Bridget stop fucking talking you street-tard.
by February 25, 2022
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