to bend over and bare the rump to someone as a sick joke. Also,as a noun,a bared rump exposed as a sick joke.
"A jacket is better than an overcoat,because you can moon people with your coat on, that way!" said Kenny,Kevin,Uriah,Harun,Jamie,Matt,Robert,Bill,Jim,and Tom,as they pulled down their pants and exposed their moons.

"Oh,come on! We're not mooning you,we're only showing you where poo comes from,little kid!" exclaimed David,Greg,and Mel,as they pulled down their pants and exposed their moons to the little kid. They really were mooning the child.
by JMC70 December 15, 2016
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to welch on a bet
You ever get paid on that bet?

Nah man, I got mooned by that fag.
by sjandb October 22, 2008
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used by Navan/Meath people (Co Meath, Eire ). Meaning crazy, or used to portray astonishment.
That fella's moon - that guy's crazy!
Thats moon - thats amazing!
by shakey hand dancer March 9, 2005
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to make a bet, shake on it, and then refuse to pay when you lose the bet
Joe - Did you win that bet?

Adam - Yeah, but I never got paid because the dude pulled a moon on me.
by Burned to a crisp October 6, 2008
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the act of being rediculously pro/good looking at the game of counterstrike
moon be gettin that money, fools a nut.
by anomaWALL April 22, 2009
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something unpleasant that may cause you to giggle or may become an inside joke.
The moon shines bright...

And shows up especially...

In the right light...

But no one needs to see the moon...

Not because it's so white...

But because no one needs to know...

What the moon did that night.
by The Moon February 8, 2005
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