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ceff is derived from CEFF which is an acronym for, "Cats Exploding From Farting." Cats under normal circumstances could never actually explode from farting. But, from EXTREME CAT EXTROSCITY EXTREMENESS EPIC CAT AWESOMENESS cats can actually explode if they reach this level.

If things are so extreme that they reach this level then they are 'ceff'.
Woah man, it's so...so...ceff. I can't even explainit.
ceff by krunko September 6, 2010
Related Words
ceff Ceffareno Ceffo ceffy
The shipping of James Cook and Elizabeth Stonem on the british television series Skins.
"Last week's episode of Skins converted me from a Freffy shipper to a ceffy shipper!"

"Oh my god, I know. Ceffy own Freffy!"
ceffy by whatthefrack September 5, 2009
An Italian term for penis (vulgar). pronounced with a hard CH---"CHef-O"
Vinny just gave her the ceffo.
Ceffo by seawitchypoo August 28, 2013

Ceffareno 

one among many, marvel, anomaly,
Deviation or departure from the normal or common order, form, or rule.
"No gentlemen can emulate Ceffareno."

Astronomy The angular deviation, as observed from the sun, of a planet from its perihelion.