A distasteful error or lack of decorum in an appropriate setting. A disgrace, a complete failure, an "L". A display of poor judgement in the use of language, form of dress, behavior or a lack of couth in general. A fail.
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.