adult-tard 

An adult who does ridiculosly stupid things as a way of showing their maturity. Eg; when a little bird finds it's way into a classroom of fifth graders, and adult-tard would be the first one to catch it and call animal protection, instead of letting it fly away. Making oddly stupid rules and descisions is another habit of adult-tards.

At my school, they caught someone smoking in a restroom stall and the adult-tard principle made a rule against using the bathroom.
(true adult-tard moment)

adult-tard by happyhappyjoyjoy May 28, 2007

Adultard 

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?"

Adultard by onlikepopcorn December 9, 2012