i'm scared of you
Exclamation meaning someone's response was so good or correct that you would not challenge it. Similar to 'You go, boy!' or You go, girl!'
Mother, while putting away laundry, says to her teen-aged son, 'Do you know where the dust cloths go?" The son replies, "In the laundry room closet, on the shelf next to the furniture polish." The mother replies, "ooo I'm scared of you!" in a surprised voice.