Apparently, the top definition tells us it means when a girl's ass is hanging out of her pants.

Instead of using normal words to describe this, retarded people from the mean streets of harlem or whatever, decided to use some "urban" funky words. 99% of the slang that exists is fucking stupid, i mean, what the fuck is shizzle my nizzle, for the good of humankind, if you ever hear that phrase mutter, shove your fist at speed into whoever said it's mouth.

This is stupid, bad moon on the rise, is derived from the Creedence song, Bad Moon Rising. Its a phrase used to describe a bad omen, or bad things on the horizon.
When people bastardise normal words for such a stupid phenomenon, i see the Bad Moon on the Rise.

Yeah, shut up with your stupid made up slang, fuckfaces.
by bastardo_bill September 9, 2004
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(n.) -- the unfortunate view you get when a girl sitting in front of you is wearing very low shorts and a g-string or a thong.
Bad Moon On The Rise is actually a song title, but it fits this phenomenon because the "moon" refers to the girl's rear end, and the whole phrase implies that it's not a generally pleasant thing to look at.
"Ew, look at that girl!"
"Total bad moon on the rise."
by Bria June 6, 2004
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When something bad in the foreseeable future is about to happen.
Johnny:My parents found out about the broken garage window and now they're pissed.

Jerry: I see a bad moon rising
by the fax February 11, 2009
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When you are mooning someone and then do a liquid fart.
Scott: Ariel what happened to your white sweater?
Ariel: Man, Jimbo did a bad moon rising to me before I could stop him yo'.
by SkatManDo December 12, 2010
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Friend #1: Hey, did you get some last night?

Friend #2: Naaaaah, Bad Moon Rising. Gotta wait a few days until the moon sets...
by The Original Biggus Dickus August 9, 2011
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When friend is another room with a glass or tainted window ,and another friend lifts you up to moon the person in the room.
“I was taking a shit and it was all fun and games until the bad moon rised. Or
I saw the bad moon rising
by Salade Harry July 31, 2020
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