A term coined by Al Pacino in "The Scent of a Woman." It means absolutely nothing, but it is often used to make a reference to Pacino, or his character in the movie, Lt. Col. Frank Slade.
Lt. Col. Frank Slade: Well, gentlemen, when the shit hits the fan, some guys run and some guys stay. Hoo-hah!
by Benaiah December 10, 2004
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Tits / Boobs / Breasts of a female human being.
I went to the titty bar and the stripper rubbed her hoo hahs in my face for $1.
by crypto-jypto July 25, 2003
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Hoo Hah is a term used to describe a combo done by Diddy Kong in Nintendo's Super Smash Bros. For Wii U and Nintendo 3ds. Hoo Hah was received quite controversially among the the Smash Bros competetive play community because of it's overpowered nature. The combo was performed by using a down throw to an up-aerial move often causing crowds to shout out the name they had given it - the Hoo Hah. Due to it's earlir mentioned overpowered nature, it became quite infamous, and so did Diddy Kong players alike.

The combo was ultimately removed in an update patch for the game by Nintendo April 15th 2015. Since it's removal, the Hoo Hah has become a fairly popular meme.
Examples of how it's used

Example 1: Oh man! The Hoo Hah is so damn OP (overpowered)

Example 2: You should've seen Hungrybox getting Hooh Hah-ed by Player 1, he popped off his chair!
by Not ZeRo March 3, 2016
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the penis, schlong, wang, weiner, purple-headed-yogurt-squirter, etc.
My hoohah is bigger than your hoohah
by Nate Dogg September 9, 2003
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A phrase used by Etika, a streamer.

Used when talking about a cock.
Etika: THAT'S A FULL FUCKING HOO HAH!!!!!
by Butternutfuck2001 June 27, 2018
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A name one puts on facebook in order to confuse others and hide one's identity.
Woo has his name on facebook as Ooh Hoo Hah. I hate it when people do that!
by Michelle...what? January 14, 2009
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Hoo to Hah (hoo-hah)

/ho͞o/ /to͞o/ 'ha
noun

The general estimate of one's vagina from top to bottom.
Well, I think mine's from about Hoo to Hah (hoo-hah). *indicates size with hands* If you must know.
by Duendita March 20, 2019
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