What is meaning of jailbait?Is it a bad word?

It means someone, usually female, who is attractive, maybe even flirtatious, but who is below legal age for sex. So if you take the "bait" you could go to jail, since sex with an underage person is a crime. It is not a vulgar word, but it is not polite either.

It refers to a child or young person who is sexually attractive, but below the age of consensual sex in their location. In other words, if an adult had sex with them, they'd go to prison.

Jailbait is a term applied to a person who is below the age of consent, so if sexual advances are made towards an appealing person who is too young, then the pursuer can be risking committing a crime and being sentenced to jail.

JAJLBAIT is a girl that is only 14 or 15 or 16, but looks 21.

Having sex with her will get you sent to jail.

an attractive girl who has not reached the age of consent.