a living erkki
a person who thinks they're the best, but can't even do basic stuff without a meltdown
My little brother is a living erkki. He said he'd win the race, but he tripped and cried.
My boss calls me a living erkki because I can't even send an email without making a mess.
My friend is a living erkki. She said she'd clean her room, but she ended up yelling at the closet.