Shake it momma!

I was teaching Dawson how to cut watermelon with a butter knife, a good song came on the radio and he said, " shake it momma' I busted up laughing so hard I almost peed my pants. Then I start signing and he says, "mom, don't sing" no matter how hard I tried he would not tell me why? I wonder if it has anything to with the same reason when I sang to him when he was ten months old and he covered his ears and shook his head back and forth???