jaat buddhi
a person who thinks they're smart but acts like they're stupid on purpose
'He said he's a jaat buddhi to make people laugh. It didn't work.', @JaatBuddhiJoke
'She called herself a jaat buddhi just to annoy me. It worked.', @AnnoyedFriend
'He pretended to be a jaat buddhi just to get out of doing homework.', @LazyStudent