When you rub your belly after fondling your gun collection. Your belly is wet on account of the jizz that comes out of your dick when fingering a barrel hole.
I stuck my finger in the barrel of the gun, and I spontaneously came on my belly. I couldn't stop jiggling my wetbelly.
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.