A Water Style jutsu used by Naruto Uzumaki in the 241st episode of Naruto Shippuden. In order to do Rasen-pee, you must pee in any direction and then shout, "RASEN-PEE," while peeing.
Naruto: I really got to go... GOTTA BLAST!
*enters restroom*
Naruto: Go! RASEN-PEE!
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. 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.