In Mexican Spanish, 'culero' is a vulgar slang term often used to refer to someone who is mean, unfair, or unkind. It can also be used to describe actions that are unfair or malicious. Note that this term is quite offensive and should be used cautiously.
Examples
- Spanish: No seas culero, devuélveme mi dinero.
- English: Don't be a jerk, give me back my money.