a male or female who happens to be incredibly large and most of the time have a foul stench hence mcnasty. you can usually find these people at bars, ctreet corners, parties, and dances. there is a small chance that you could see a fatty mcnasty at a show. those are referred to as scene fatty mcnasty. those are clearly the worst type of fatty mcnasty's.
me: damn did you see Aly?
guy1: yeah. shes gross. i hear shes scene fucked everyone in every band in this showcase.
guy2:jeez! thats one fatty mcnasty right therrr!
guy1: yeah. shes gross. i hear shes scene fucked everyone in every band in this showcase.
guy2:jeez! thats one fatty mcnasty right therrr!
by gina[thelumberjackie] October 7, 2007

(noun) Plus size women down to seduce Kenneth West, Moe's Burrito Artist.
(adjective) Oversized women willing to pursue sexual intercousre with gingers.
(verb) To Fiesty McNasty
(adjective) Oversized women willing to pursue sexual intercousre with gingers.
(verb) To Fiesty McNasty
by Senior Gato February 17, 2008

by Angelic_Sherry June 11, 2006

by donpedro101 November 16, 2011

when someone eats their food in a manner that would induce vomiting from anyone unlucky enough to be near them at that time. especially people that get grease or sauce all over there face while eating. the more zits the more likely you are dealing with a true Thasty Mcnasty.
by hookman13 July 9, 2010

by JiSiL October 18, 2014

by philbert trumpeteer poop January 1, 2004
