décalottage

Etymology
From.

Noun

 * 1)  an uncapping of someone, a removal of the cap from someone
 * 2)  an opening of any oblong or vertical object by withdrawing its top part, or an uncovering of the top of such an object by withdrawing what covers it
 * 3)  an uncovering of the glans penis or glans clitoridis by pulling back the foreskin or clitoral hood