A word subject to distinct variations in form, acting as a substitute in sensitive situations, i.e. a parent cannot know exactly what you are speaking about or to who you are speaking too, but the conversation persists under the given circumstances.
Also, the unknown designated scientific name for the back of the knee.
As a substitute: Sally got an asterfresterniss in the butt, she hasn't shit right for a week.
As a scientific term: I hurt my asterfresterniss on the stick