jail bait

1. colloq.
   
   Any boy below the age of consent, so named because sex with a under age boys could land one in prison.
   See also: ▶forbidden fruit, ▶jail bait, ▶jail house pussy
2. Attract, young man or boy, use by the police to entrap gay men into performing an act sex in a public.
3. Attract, young man or boy, use by the criminal element to entrap gay men into performing an act of sex to blackmail them.