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2.
The area of the leg where the upper thigh and buttocks meet, but has little to no definition. It's like Cankles, only higher up on the leg.
I was an idiot and ran 2 miles on a treadmill when I can barely get from the couch to the fridge without wheezing. I think I pulled a muscle in my thuttocks.
by Ephemily January 17, 2013
 
1.
Similar in orgin to "cankle" (CAlf plus aNKLE) the "thuttock" is the seamless fusion between the THigh & bUTTOCK in a morbidly obese individual.
Look at Belinda's thuttocks.
by Frasier Nutzov March 07, 2007