HmmmYouDontKnowIt Share definition Flag Some retard on this godforsaken website who is incapable of being funny, ironic, and relatable. HmmmYouDontKnowIt is a prime example of why a mentally stunted child should not be exposed to the internet. #AutismSpeaks 2022. HmmmYouDontKnowIt by Yöur pseudonym October 15, 2022 0 0 Get merch