The pairing from My Hero Academia (or Boku No Hero Academia) concerning Denki Kaminari and Shinsou Hitoshi. It is one of the many rarepairs of the show but is still quite popular, despite the fact that the two characters have barely interacted on the show but have more in the manga
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.