Used to spook anyone at anytime.
Just hide behind a corner and say boo in a monotone voice at someone turning that corner they instantly die of spookedness
Person1: boo
Person2: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Person2: *actually dies*
by Meme man the madlad December 22, 2020
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A ghetto term of endearment for your significant other. Possibly for your baby momma.
"Heather is my Boo, now and fo-eva fo-sho"
by Patricia Reyes March 04, 2007
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A scary ghost creature in the Mushroom Kingdom. Mario faces these a lot. These pearly-white ghosts will become invisible if anyone faces them. They usually cannot be disposed of. There are also other Boos, like the Big Boo, King Boo, and more.
"I thought I heard a Boo, but I turned around and saw nothing."
by SeaCaptainDrake December 06, 2003
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A ghost enemy in the franchise Super Mario. Some people use it as a name for thier love, when really they're calling thier love a fucking ghost.
-"My boo is so sweet, we kissed during the movie.."

~"How the fuck do you kiss a ghost?"
by BestBuyGuy October 26, 2014
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when i ghost says Boo, it means I am a gohst, fear me.
Courtney is walking into a haunted house, a ghost pop up and says Boo! ...
by F4TE September 04, 2004
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