To describe someone utterly stupid; might be slightly offensive
You heard Timmy was at the lockdown protests?
I know right, kid's mad tismatic!
2👍 1👎
Tismatic is the hidden super power caused by autism.
Unbeknownst to Timmy, just by working in the same vicinity as the engineers, Timmy has absorbed their knowledge for himself. That Timmy sure is such a tismatic, he never even had to study!