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I'm training for a 50 mile trail race. Getting up at 4AM sucks, FTSRITF
FTSRITF by FSocks July 31, 2017
n.) Someone who is an obvious bullshit liar. v.) The act of making a bullshit lie.

Of course this can also be used as an adj, adv, etc. The main idea here is that the word "fossitt" somehow relates to the most blatent, obvious lie you have ever heard.
n.) "Hey Tim! I won the lottery!""Alex, you're such a fossitt". v.) "Hey Alex, my car can go 300 MPH!""Really?!""No, I'm just fossitting ya! lol".
fossitt by none January 28, 2005

dripping fossit 

when you get a girl real wet, then she stands above your head with her legs spread, and lets her cunt drip into your mouth.
i almost drowned from that dripping fossit last night

fositive 

Dick was absolutely fositive that Jane was cheating on him
fositive by Blue Train Cooley March 8, 2015

fospital 

A place where the FOS (full of shit) go to be cured of compulsive lying through a combination of electro-shock therapy and regular slaps in the head. If there is no fospital in your vicinity, please apply first aid (Swift slap in the head)
Yeah, she should check-in to the fospital.
fospital by slaptack July 8, 2011

Fosaitis 

like touretts but with laughter
Danielle and Cory got infected with Fosaitis today at work.
Fosaitis by MADCory August 23, 2011