くっ Japanese meaning | KotomoraMeanings
1
interjection
tch; ugh; damn
An interjection expressing frustration, annoyance, or a stifled exclamation. Often used when clicking one's tongue or suppressing a stronger outburst.
Similar tongue-clicking interjection, but ちっ is often sharper and more openly annoyed, while くっ can sound more like a suppressed groan.
Etymology
A sound-symbolic interjection; the exact origin is uncertain, but it likely imitates a stifled grunt or tongue click.