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1.
something that is built up to be great but is utterly disappointing. The Fossa is a meat-eating mammal from the island of Madagascar and was built up at Marwell Zoo to be the most 'mysterious creature' about. It was rubbish.
Will: The new Wembely stadium will be ready soon
Megan: I hope its not a fossa
by Will Satterthwaite April 16, 2006
7 7
 
2.
Despite the previous definition, (which also happens to be spelled incorrectly - ie: Foosa), this animal does indeed exist. It is NOT however a slang term used to refer to hyenas, as previously stated. Many people have recently been introduced to this animal by the movie "Madagascar." The Fossa(Cryptoprocta ferox)is the largest carnivore endemic to the island of Madagascar, and is a catlike member of the civet family. It usually hunts alone and commonly feeds on birds and lemurs but also preys on livestock. This is precisely why the lemur characters in the movie were always afriad of "The Fossa!"
For an expanded definition and pictures of the Fossa please see Encyclopedia Brittanica online.

"We thank you with enormous gratitude for chasing away the fossa (foo-sah).
"
- Julian
"Madagascar"
by CrrrlyGirl March 17, 2008
4 5
 
3.
When something gross happens; Instead of saying "sick" or "gross" or "disgusting"
Person 1: I had to clean the bathrooms today
Person 2: Fossa...
by blacknite December 07, 2006
4 7