1) having the qualities of jail bait.
2) generally having eye-candy-esque qualities to pedophiles.
The jailbaicious teen had the appealing sexual qualities that Hytham desired, yet he knew that if he acted upon them he would be serious moral trouble.
To be "Jambatious" is to be a generally amazing person while still not caring about any one else’s point of view. It is the fine line between being full of yourself and being better than everyone else.
Why Patrick, your looking quite jambatious today! Don't get too happy though or you will start looking like an idiot.