Also known as malebait.

Male jailbait are sexually attractive males who are under the legal age of consent, but physically mature or approaching maturity to the point where their status as underage is ambiguous.

Male jailbait (or malebait) are so termed as engaging in relations with such persons would result in a jail term and being placed upon the sex offenders register.
Girl 1: "Wow, that guy is so hot!"
Girl 2: "Eww! That dude is clearly a high school! He is such male jailbait! You're such a pervert!"
by Brafish December 24, 2014
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