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.
When someone comes suddenly and you were not expecting and you felt terribly frightening. You were so frightened that you meant that the person made the shit comes out from you.
The ability girls and women have developed to hold several items at once in one hand. The skill has been developed due to the lack of pockets in women's clothing.
I thought she'd need multiple trips to carry her phone, keys, wallet, and Starbucks to her car since she needed the other hand to open the door, but she used her impressive girl grip to carry everything in one hand.