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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"
Fossa by CrrrlyGirl March 17, 2008
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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
fossa by Will Satterthwaite April 30, 2006
Related Words
A deep groove on a flat surface that magically attracts readas to be stuck in them. Commonly found near Via Appia.
Cave fossam!
Reada in fossa est.
Reada adhuc in fossa est.
Fossa by Yes, I am a Mike January 30, 2017
A kind of ditch that magically attracts raeda to be stuck in it.
Raeda in fossa est.
Cave fossam!
fossa by Flawia December 24, 2016

pearl necklace fossa 

aka "sternal notch." a great place to deposit semen when you give a girl a "pearl necklace."

helix fossil 

The God of Anarchy and father of Bird Jesus. The prophecy says the helix will guide his followers though all evil and silence the democracy of the dome.
helix fossil by aaabaaajss March 2, 2014

FassAvoy 

(Similar to McBender or McABender.)

1. The portmanteau couple name for the James McAvoy and Michael Fassbender RPS pairing.

2. Fandom involving the two actors James McAvoy and Michael Fassbender.

3. A good example of bromance that has spread like a wildfire after the newest X-Men-movie "X-Men First Class" where the two actors played Professor X(McAvoy) and Magneto(Fassbender) together.

4. Also claimed to be a lifestyle cultivated by fangirls of the McBender Bromance.
TumblrFangirl 1: OMG I just saw "X-Men FC" for the third time!! FassAvoy never gets old!!!<333

TumblrFangirl 2: Keep calm and ship FassAvoy/McBender!<3
FassAvoy by ThatDanishChick July 10, 2011