After eating, using vomit inducing substances so that you don't have to use your fingers.
Can be used as a prank, or mainly by Bulimics who don't like poking their throats to puke.
"Chuck" comes from "Upchuck", to throw up.
Have you seen donna? I heard she is on the chuck adkins diet.
Makes her body look TIGHT.
"What is the Chuck adkins diet? It's like the Atkins diet, except all calories in, all calories out, you get me?"