A shart (a fart accompanied by some liquid poo) exploding from the anus following the consumption of greasy fast food such as Mcdonald's, Long John Silver's, or Kentucky Fried Chicken.
Damn that catfish platter at Long John Silver's was greezy; it done made me Mcshart on my damn self!
by BartlebyBreakingBad July 28, 2013
Usually happens after eating the greasy food from a McDonalds, it is an abundance of dairy air mixed with a bunch of wet poop particles mixed within
by Fr0sty33 October 29, 2014