habitual bungler
A person who messes everything up and never learns. They're the f@&% up of the group.
He forgot his keys again. It's like he's got a key-shaped brain that doesn't work.
She always loses her phone. It's like she's got a phone-shaped enemy that hates her.
He wears mismatched socks every day. It's like he's got a sock war on his feet.