Much like a selfie. You take a picture showing your face, except it shows part or all of your ass in the photo. Usually using a mirror. Post it on Facebook statuses and such for tons of humour.
She didn't have a selfie but she did have a moonie.

"Wow, nice ass!"
by Blackskull1337 May 15, 2014
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1: The bearing of ones backside in a specific direction.
2: Some sort of a crazy cult over in the USA
by Josquius April 14, 2004
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A forumite regular known almost exclusively for SPAM, insults, and petty hissy-fits. Common traits include issuing death threats and hollow insults. Can be used to describe a users personality, online persona, or posting qualities. A common substitute for the word 'noob' (see noob).
"Jesus Christ dude, WTF was that - you're the new Moony"
by A. Secret August 7, 2006
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An explitive, used in the place of commonly known 4-letter words.
What the moonis? That guy just slammed a dale in his juice!
by Moonis Kline March 23, 2005
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small crazed commy why mumbles ina low tone.
if youre lookin for moony ian moony
by Rob Lucas May 12, 2003
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A moonie moonie moondog is a cannibal who feeds on the sweet blood of children in the hour of darkness.
“Is that a moonie moonie moondog!!!”
“Yes gather the children for sacrifice!!!!!”
by Cannibal 101 May 26, 2020
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Give me your moonies bitch or I'll break your leg D:
by Muddymess January 26, 2009
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