It means anything you want it to be, BIATCH.
That one entry where it says it's an onomatopoeia? PSSH.
They're t0t3z1y wrong.
Me - OMG, did you see that girl's outfit? It was so KASTANG!
Person - Totally! It was KASTANG-ingly! KASTANG!
Person - d00d. I'm totally KASTANG! right now. I could kick that girl's KASTANG!
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