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1. Immaturd
Someone who tries to act mature but ends up making themselves seem retarded.
Guy#1: Hey guys i totally had my first blunt today. Now am I old enough for you?

Guy#2: Dude... stop acting so immaturd... your embarrassing yourself.
2. immaturd
one is immature and appears at first glance to be a turd
Lindsey Lohan is a classic example of an immaturd
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