Cutebait

A compliment meaning an underage girl who is sexy in pictures online. Used to encourage young girls to post sexualized pictures of themselves online.

Such girls usually tag the pictures with the term (cutebait) in order to gain the attention of people to comment using the term or other such compliments.

To qualify for the term the pictures usually must either reference the girl's age or show some proof of her general age, such as a school uniform.
Term comes from the term jailbait.