D-Minus
A person who is so bad, it’s like they failed life, but you can’t say they’re an actual piece of garbage because you don’t want to scare the little kids.
My uncle said, 'He’s a D-Minus, not a total disaster,' when my dad tried to eat a sandwich that was already moldy.
My brother said, 'You’re acting like a D-Minus,' when I accidentally screamed in a library.
My neighbor said, 'He’s not the worst, just a D-Minus,' when my dad tried to fix the TV with a banana.