As dectected in the fuel supply by W.C. Fields. The term "Ubangi" denotes a black person. Taken altogether, the somewhat-famous Fields quote simply indicates something out of place or awry, some evil intent. Fields wrote in the 20's and 30's, so those people in positions of social power then didn't necessarily consider this offensive.
"I detect a Ubangi in the fuel supply." -W.C. Fields
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.