Diao Share definition Flag (taiwanese slang) meaning cool, or to describe a way a person does things that is extraordinary and takes others by surprise. A:"Oh my god, that bike stunt was SO diao!" Diao by yalayala June 14, 2004 Words you can keep railfan mug chonk mug chud mug based mug 67 mug slime mug mogging mug chopped mug thot mug glazing mug huzz mug yams mug larp mug unc mug cracked mug simp mug baddie mug bop mug lolcow mug