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A little sompin' sompin' is when you're too scared to say what you really mean, usually because it involves doing something illegal or getting laid.
Yo, I ain't tellin' you what I saw. It was a little sompin' sompin' and I don't want to die.
She didn't say the name of the guy. Just said it was a little sompin' sompin'.
He got caught with a little sompin' sompin' and now he's in jail.