The act of spending time obsessing over something or someone. Like a crazy person, covering their walls with pictures of this other person, or constantly going on about him/it/her, so much so that the slightest reference to this object person drives everybody else crazy.
Dan: "Where is Jim?"
Mike: "Mooning over his ferrari collection."
Dane: "Again?!"
Mike : *nods sadly*
by Mytola August 6, 2006
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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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Verb (informal), used with or without an object: to consider or to think about; to mull

Note: may be used actively or passively.
Jack (to Marie): Are you down in the dumps for what happened?

Marie: Not at all. In fact, I don't want to moon it.
by dajo10 August 17, 2010
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mooning is when guys drive around in a car with their boy-buns showing out the window.
A bunch of us cadets are going to drive around campus mooning and showing our boners for Halloween!
by eda-skip October 20, 2021
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