LET THE FOOT DO THE REST

Slang for diabetes. The reason is that oftentimes people with severe Type 2 diabetes are obese and have a high sugar intake level. One's feet are highly susceptible to damage from Type 2 diabetes due to the sugar intake, and sometimes the tissues in their feet dies and it needs to be removed.
"Doctor said that if I don't stop eating deep-fried twinkies for breakfast I'm gonna get sugarfoot and he's gonna saw off my leg!"

by Thomas_Edifun November 2, 2017