Top Definition
A person that acts so grown up, it makes them retarded.
My adultard friends think comic books are for kids.

I thought the moshpit would be better, but it was just a bunch of adultards playing grabass

"of course you can play with fireworks, son. Did you think I was an Adultard?"
#grownup #adult #retard #lame #old
by onlikepopcorn June 03, 2012
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