BFG kids are people in a Roblox game named Phantom forces. They are usually low-level kids who pre-bought this shot 0 drop sniper and annoy the fuck out of every high-ranking player.
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.