Someone who cannot be roasted, takes comedic comebacks, putdowns and teasings extremely well. To the point where they may even turn it around and take it as a compliment. They know their flaws and acknowledge them, and are proud of them making it simply impossible to roast sed person.
Bill: I’ve been trying to roast Jim for weeks, I tried his big nose, small penis and even the fact that he failed earth science
Bob: That guy is unroastable
Bill: I would try his daddy issues but that seems a bit far
Bob: you could he would just thank you, he’s completely bulletproof
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.