When a student smuggles a muggle into Hogwarts to cheat in muggle studies, it's called muggle smuggling or "muggling".
The word combines "Muggle" (a non-magical person in the Harry Potter universe) and "smuggling" (the act of sneaking contraband).
"The aurors successfully busted a muggling ring today in which several students were involved with sneaking muggles into Hogwartsvia a tunnel through Hogsmead"
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.