A "Seba game" is usually a pixel single player game with either high skill or high luck gameplay, maybe a combination of both, that isn't really talked about on the internet or it will be talked about in a few years, with replayability and a bunch if different playstyles
Most roguelite/roguelikes fit this definition but a Seba Game can be found in many genre of games.
Man, you really like these Seba games... How did you find this genre?
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.