When you shit yourself while riding your bicycle, and saidshit hits your back tire then sprays upwards leaving a rooster tail pattern of shit up your back.
I had a greasy breakfast before that long bike ride which led to a Pooster-Tail. I feel bad for the guy behind me...
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.