jail bait
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jail bait | Slang referring to the under aged partner in a sexual relationship.
Meaning
Most common definition is in reference to a sexual partner that is not legally of age, to have consensual sex with.
Jailhouse Pussy referenced an underage female.
(obsolete definition) Referred to an underage prostitute.
Noteworthy:
Sex with one under age, whether consensual between the parties or not, is a criminal offence in most Western Countries, that does lead to jail time, and in many cases will cause the older party to be labeled as a sex offender.
Most will classify such an offence as RAPE.