Acronym for Full of Shit Southerner. Used to describe a person from the South (including but not limited to the following states: NC, SC, GA, TN, AL, MS, LA, VA and KY) who is politely being evasive, untruthful, disingenuous and/or passive aggressive. A common behavior found in regional southern culture and widely deemed unacceptable to a northerner, who typically values being forthright. For example, the acronym is applicable when someone is 'yessing' you to death and truly means 'no'.
"That person was a FOSS. She kept saying she's love to buy a timeshare from me, and when I asked her for her credit card, she made all sorts of excuses."
"Total FOSS's. They're from North Carolina."
"Total FOSS's. They're from North Carolina."
by TSnyc September 6, 2014

His fist bumps are more powerful than Chuck Norris' roundhouse kick which causes you to be the epitome of awesomeness. His Datsun looks like a bad car but can go 17000 kilometers an hour and fly. He is a sexual beast and cannot be tamed, his body is ready 100% of the time. You will not expect it but you will know when he is there. If you ever meet or talk to him it will be the best moment of your life.
by the awsome creator of the foss October 31, 2012

Dude 1: You coming to Max's party??
Dude 2: Of course
Dude 1: Okay dress up
*Next day*
*Max opens the door sees guy sitting in with legs crossed guy bites his lips and tells max to come over*
Max: OMG ITS A FOSS!
*Max runs in the house*
Dude 2: Of course
Dude 1: Okay dress up
*Next day*
*Max opens the door sees guy sitting in with legs crossed guy bites his lips and tells max to come over*
Max: OMG ITS A FOSS!
*Max runs in the house*
by >;3_Yur_Wrst_Nightmare_>;D March 2, 2010
