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The act of masturbating twice in a row, followed by fornicating with one person, followed by a three-some, followed by a five-some, followed by an eight-person orgy, followed by a thirteen-person orgy, etc.
That fibonasty was crazy last night. There must have been at least 144 people in my house by the end.
fibonasty by leonardo_fibonacci February 2, 2015
Related Words

fish nasty 

receiving mung while being fucked in the ass by a horse, dipping your dick in battery acid, and being shat on by a midget.
fish nasty is about 2.7 times more gratifying than masturbating with a handfull of broken glass
fish nasty by oh-yeah-cheez March 29, 2005

fastnasty 

Somebody who is fast and nasty. They are quick to jump into bed with you. They like getting down and dirty.
Kristin is a total fastnasty, especially when it comes to getting with Shane.
fastnasty by kKRASH & gBOWL May 19, 2009

fishanity 

All fish, collectively.
Killing that toadfish was a crime against all fishanity.
fishanity by pebmommy December 31, 2011
Super fine good looking person who has a nasty naughtysexy body. Its fine and nasty combined
Damn that girl is finasty!
finasty by twotrick March 26, 2016

Fishtastic 

Tainted seafood taco of a crab shack that offends the olfactory senses without unzipping the pants.
As I was making out with this girl I noticed that her vagina was quite fishtastic and had to immediately leave.