A blue eye that that Sans unleashes as some sort of last resort when he has a hard time defeating Frisk in the genocide route (uncanonically the eye is some sort of blue fireball)
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.