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1.
A "warm and inviting" term / euphemism for vagina.

Created by Rayne of "Least I Could Do".
You are a giant vagoo.
Mmmm... vagoo.
by Bob Santos February 23, 2005
 
2.
An alternate name for a woman's vagina, as introduced by the Rayne Summers character on the Least I Could Do webcomic.
What? You need an example on how to use a woman's vagoo?
by Zecc June 20, 2006
 
3.
An alternate name for a woman's vagina, as introduced by the Rayne Summers character on the Least I Could Do webcomic.
What? You need an example on how to use a woman's vagoo?
by Zecc June 18, 2006
 
4.
Another name for the little pink hole that is on the underside of women; the well-known male PENIS is inserted into it when it is erect. It is also what motivates men to have babies.
Brad: Hey, can I see your vagoo?

Jenny: Sure! (smiles)
(shows vagoo)

Brad: Wow, that is a nice vagoo.

Jenny: I get that a lot. Thank you.
by Mr. Homie Nigg August 09, 2010
 
5.
Vagina or, more correctly, the vulva.

Should not be confused with Mr. Magoo.
Is it true that some women shave their vagoos?
by Chad Dirkly March 14, 2010
 
6.
Slang for a woman's vagina.

Mistakenly credited to 'Least I Could Do', but actually first showed up in the pages of a Fate/Stay Night doujinshi years before the webcomic used the term.

Since the original doujinshi censored the word "vagina", it showed up as vag followed by several OOOs.
"Here! ......My vagOOO! To my... my..."
by Otaku-na November 23, 2009
 
7.
word commonly used to replace the word 'Vagina'.

Vagoo is commonly used on a popular image board, in such phrases as "GODZILLA DEMANDS VAGOO" or "GHANDI DEMANDS VAGOO".

Vagoo refers to the vagina and also the substance in the vagina. ei; 'Augh dude she pulled it out and it was all covered in vagoo'.
"Did you see Alec last night? His shirt smelt like fucking vagoo!"
by LehAnonymous November 15, 2009