noun
minor business; errand; chore
A self-deprecating or casual way to refer to a personal errand or trivial task, often used when excusing oneself. The word 野暮 (boorish, unrefined) adds a nuance of something mundane or unglamorous.
ちょっと野暮用で出かけてきます。
I'm heading out for a quick errand.
週末は野暮用がたまっていて、どこにも行けなかった。
I had a bunch of chores piled up over the weekend and couldn't go anywhere.
Compound of 野暮 (yabo, 'boorish, unrefined') and 用 (yō, 'business, errand'). The exact origin is uncertain, but it likely arose as a casual, self-mocking expression for mundane personal tasks.