blunder; clumsy mistake; goof
Colloquial term for a careless mistake or clumsiness. Often used self-deprecatingly or to tease someone lightly.
I messed up again.
He's the clumsy type and is always forgetting something.
He can be clumsy, but you can't hate him for it.
I got nervous and messed up again.
clumsy girl; klutz
Katakana spelling is standard for this colloquial word.
Hiragana spelling is also used, especially in casual writing.
The origin is uncertain. It may be related to the mimetic word どじどじ (flustered, confused), but the exact derivation is unclear.