What is an informal term for a person who can't do anything right? [closed]
"All thumbs", according to Wiktionary "clumsy, awkward, not dextrous."
"Klutz", according to Wiktionary "a clumsy or stupid person."
If you’re looking for vulgar slang, “fuckup” is a good option:
an extremely offensive word for someone who often makes serious mistakes or fails completely
https://www.macmillandictionary.com/dictionary/british/fuck-up_2
Screw up works too, but it’s not as offensive.
Both of these words are also verbs.