A Fighting Game term which refers to the box-like or circle-like descriptors attached to a character's model showing where they can and cannot be hit. When the hitbox of an attack meets a character's hurtbox, the result is a successful hit. Hurtboxes are typically invisible during normal gameplay and do not line up exactly with a character's model.
In Super Smash Bros. Melee, Mr. Game & Watch's shield doesn't cover his entire hurtbox, meaning he can get hit even while shielding.
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.