To be in a state of such utter unawareness toward social norms that one could be mistaken for a (mongoloid).
Person 1: Wow ,Charlie and Denise just farted, turned to each other, and screamed beep beep during the christening.
Person 2: Yea... They're definitely on the mong.
Person 2: Yea... They're definitely on the mong.
by MisterBisquits96 June 25, 2019
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