dakko

A word that has no meaning but is meant to annoy

if someone asks what it is just say it has no meaning in a sarcastic voice, you're telling the truth but they won't believe it

paul: you're such a dakko
tim: the hell does that mean
paul: that's why you're a dakko
tim: what does that mean
paul in a sarcastic voice: it has no meaning
tim: yeah right, like i'd believe that