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the Southern way of sayin "I Swear" but they"re too polite to drop the F bomb, so they use the Suwannee instead.
I Suwannee I'll kill you if you don't stop naggin me about the laundry.
I Suwannee I'll eat your whole family if you don't let me sleep.
I Suwannee I'll kick your grandma out of the house if you don't shut up.