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Ja sam kool means I am cool but it's total nonsense. Serbians don't even know what kool means and they still use it like it's the best thing ever.
DM: 'Bro, I just ate 10 tacos and I'm ja sam kool.'
Tweet: 'School was a disaster but I'm still ja sam kool.'
Text: 'I failed math but I'm ja sam kool.'