A energetic beautiful girl who always has a smile on her face, loves to laugh and is very caring. Also like to help others in times of need and doesn't judge. She treats other people how they treat her whether it's good or bad. She is also very loyal and trusting unless it's being taken for granted. McShirley would be a great friend and spouse.
The term Mcshittle refers to the meaning of eating a Mc Donalds breakfest sandwich such as a Mcgriddle or any other sanwich and after 5 mins of being done with it. You start shitting horribly. Thus having the Mcshittles.
I ate a mcgriddle today and 5 minutes later I had to Mcshittle.
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!