‘Daebak’ is used satirically, but mostly it is one of the interjections which appear to be used sincerely. This could be due to it being faster and easier to type out on a normal keyboard than ‘awesome’, while also carrying a degree of prestige or association with the culture the users feel is ‘daebak’.

If you're not up for watching limbos, bottle dancing, and fire eating, your best bet might be a leisurely dinner […]

decisions of the Boards of Appeal are amenable to actions before the Court of Justice of the European Communities

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