Shoma. No, it does not stand for "shit hanging out of my ass". Fuck that. Shoma is a person. He is the greatest entertainer and showman you will ever see. He often has colored hair, and wears blue a lot. But don't let his kind appearance fool you. If you disrespect his love for anime, he will hunt you down and make you watch tentacle porn. Still a great guy though.
Person A: Let me introduce you to my friend Shoma!
Person B: Oh no.
Shoma: *swinging his glow-sticks and chanting anime songs*
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.