When you say one thing and mean your mother.
Sometimes it reveals an underlying meaning. Sometimes it doesn't. Sometimes a pipe is just a pipe.
Ceci n'est pas une pipe! (In this example, it really *isn't* a pipe, it's a bunch of canvas and paint!) (No it isn't, it's a wiki page)
Examples
In an early version of UnwrittenRules RichardDrake wrote:
Later, members of the community begin to voice their objections to violations and suggest problems for deeper communication problems that they observe or perceive.
Yes, maybe I didn't mean solutions.