she was so ugly, she looked like she'd been hit with a bag full of motherfuckers
a strong cloth [bag] (such as burlap or denim) containing 3 or more [motherfuckers], usually [tied] at the top with [nylon] [rope]
"she was so ugly, she looked like she'd been hit with a bag full of motherfuckers" What is the definition of "a bag full of motherfuckers"?