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1) To improve something retarded, making it more retarded (See uptarded)
2) Something that has been added to something else to make them form into one big ball of retardation.
3) A retard who does things that make he or she more retarded each day.
The plustard got hit by a parked car.
by Bastardized Bottomburp June 27, 2003
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Incorrect french verb for being later than
Marc arrives 9:05, 5 minutes late.

Marc: Sucre-Bleu! Je suis en retard!

Jacques arrives at 9:06

Jacques: Je Plustard Marc! Je parle merde Français. Je suid un retardé
by Kung-Fu Jesus May 06, 2004
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