— Θα με κλάσεις!
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("I fart in your general direction, your mother was a hamster and your father smelled of elderberries"):
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It could be correct if the speaker is from Northern Greece.This is not correct.
It's κλάσε μου / θα μου κλάσεις τ΄ αρχίδια, which literally means "you're gonna fart (on) my bollocks" and conveys the meaning of "you can't do nothing to me" or, maybe even better, "you're powerless, I'm not in the least afraid of you".