stingy with money; greedy about money
Describes a person who is tight-fisted, reluctant to spend, or overly focused on money. Often used critically.
彼は金に汚いから、友達におごったことがない。
He's so stingy with money that he's never treated his friends.
あの社長は金に汚くて、従業員の給料をなかなか上げない。
That company president is greedy about money and rarely raises employees' salaries.
A set phrase combining 金 (money) with the particle に and the adjective 汚い (dirty), literally 'dirty with money', used idiomatically to mean stingy or greedy about money.