When you have a long night out drinking and the next morning you have the alcohol diarrhea. Swankles occurs when you have liquid hot magma coming out for such a long period of time, that you start taking off clothes from sweating. Eventually you have to take your pants/shorts off from around your ankles due to excess sweating. The result is swankles.
You are so fucked up that you have no control over your your sensory or motor functions. You can't even speak, only noises are muttered. You walk out of the bar looking like you just got kicked in the face by a donkey. The highest degree of drunkeness possible.
"Man last night I was donkey shlankled off my ass and banged a 400 lb black chick. I have never been that fucked up before."
"Are you going to the bar tonight."
Response: "Hell yeah man I'm gettin Donkey Shlankled wasted."