A phrased mainly associated with the arts of picking up women or "bitches" by figuratively "throwing bones" to them, which is to flirt, mack or game on them with the intention of getting a woman or bitch to eat the bones which is to fall for your game ultimately leading to seduction.
"I was throwing bones at this girl last night, and she ended up going home with me"
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.