To grab someone's ass in such a way, that it seems like an accident, but isn't.
by SchwarzerWind September 1, 2003
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A supposed paranormal apparition who often causes feces to disappear immediately following defecation.
"I was taking a shit and when I looked down to see the monstrous log I had created, it was gone! Nowhere to be seen!"

"Dude that sounds like you've been visited by The Ass Phantom"

"Spooky!!!"
by TheAssPhantom April 30, 2013
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random mooning. in other words..the random flashing (showing) of ones ass to an unsuspecting victim. usually accompanied by shouting of the phrase "phantom ass!"
*john's bro runs in and does the phantom ass*

*all witnesses groan*
by ksudnsnu July 17, 2008
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The term given to someone who thinks they have a large ass but when in reality they don't.
Look at Becky she totally has Phantom Ass Syndrome

I know right
by B-Wang March 17, 2015
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