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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
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

Fossa Behavior

Behavior that reflects that of the fossa, top-chain predators in the jungles of Madagascar, and are infamously known as the disruptors of King Julien's parties in Madagascar. Fossas are known to be short-tempered and often make bad decisions for their own self-benefit without considering others in the pack. They are extremely aggressive when it comes to mating, and will pursue the mates of their packmates with no respect for themselves or others, often engaging in passive-aggressive competition.
King Julien: Watch out Mort, even though we may be away from Madagascar there are many people who exhibit Fossa Behavior
Mort: Oh noooo....KING JULIEN, LOOK! There's one that keeps calling the den, and another who keeps visiting the den to try to mate. What are they competing for???
King Julien: Fossa behavior Mort. Fossa behavior. Stay. Away.

pearl necklace fossa 

aka "sternal notch." a great place to deposit semen when you give a girl a "pearl necklace."
i filled that bitch's pearl necklace fossa the other night

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.
Praise the almighty helix fossil!
helix fossil by aaabaaajss March 2, 2014