When one has two pussies stacked one atop the other, for easy alternating insertion. Usually done doggystyle, this position is used mostly in FFM (female-female-male) porn.
Did you see Ava Devine and Alica Saint in that new Peter North flick? He stacked their asses up into double decker pussies and fucked them both, man!
A sexual position (FFM) where two women are stacked atop one another both doggy-style and faced in the same direction, so all the male sees from behind is two pussies atop each other, hence the "double decker" pussy.
"Man did you see that Peter Northvid with Asia Carrera and Jenna Jamieson? It was fucking nothing but double-decker pussies the whole first scene!
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. 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.