tromolocotudo 

Mexican term that emerged in the 80s with the popular TV show "El Chavo del 8"

Non-gradable Adj. A person may appear to be serious and quiet, however, once you meet that person It shows itself as funny, hilarious, or with an evident brain damage.

Have you met that guy? He may seem severe and quiet but he is actually a tromolocotudo guy

tromolocotudo by El siguiente Cervantes June 5, 2023