In New England area a milk shake is made of ice cream blended with milk, a milk shake is thicker than milk but not as thick as a frappe, thus a jizz shake is when you describe a guy's cum as not to thick and not to watery
by Jerry and Brian August 11, 2003
this refers to the consistence of the man's jizz. A jizz shake means that a guy's cum was neither thick or watery but had the consistence of a milk shake
by Jerry and Brian August 7, 2003