jail bae Share definition Flag When you really like a girl but she is under age. 18 Year old friend: Dude shes only 16. Thats Jail Bait. 18 Year old: Psh, yeah you mean Jail Bae. jail bae by justastreetkid April 18, 2015 0 0 Get merch Get the jail bae mug. Buy Now — $32.95 See more merch