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Japanese for 'lookin' like a total boss' or 'smokin' hot'. Basically the guy version of being cute, but way more confident and less annoying.
'Dude, that guy is kakkoii, like he just walked outta a superhero movie.'
'She said I was kakkoii when I wore that suit. I didn't even shave.'
'He's got that kakkoii vibe, like he's got a secret and a six-pack.'