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1.
The unsubtle affair. Where two people think they are being sneaky, but everyone knows what is going on.

The act of cheating out in the open, but being oblivious to it.
Joe: "Do Bill and Sue really think no one knows they are hooking up?"

Bob: "I know, right? Pretty Fat Ninja there."
by Chewbacca with a Brazilian July 26, 2013