a little sompin' sompin
A little sompin' sompin' is the thing you whisper about, it’s usually something embarrassing, illegal, or both, and you hope no one finds out.
We all know it was a little sompin' sompin', but no one said a word.
He kept it a little sompin' sompin' so he wouldn't get fired.
They said it was just a little sompin' sompin', but they got caught.