The chocolate chin is something one usually only gets the pleasure of experiencing once in a lifetime. When a lady is seated comfortably on the commode she must remove all objects that resemble pants or will block the anus or her down under theme park. As she beings to release her excrement the over intoxicated male beings to give her pleasure with the tongue skills of a dog on a hot summer day lapping up water. As she defecates the males presses harder into her vagina making sure to pleasure her. The defecation should run down his chin and neck leaving a nice strip. Then after she is done releasing her load she beings to lick the "chocolate chin" of the male who is probably throwing up.
The chocolate chin my old lady gave me made me blow chunks all over her cooter.