When a person gets so hot that a tiny sweat resevoir forms at the small of their back. Once it reaches full capacity it begins to trickle or flow down the natural crevice tween one's ham hocks (buttocks)
"Dude! I was so sweaty from rollerblading! Springtime came early and I had a buttcheek waterfall ... Yosemite-style-Yo!"
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.