Jack Apple Chin
Not to be confused with the whiskey of the same name, this is a special alternative term to describe dimpled chins instead of "Butt Chin". Unlike "Butt Chin", this new term describes how the cleft chin itself is more shaped like an apple instead of the human buttocks, as with how the verticle cleft within the chin also resembles a vertical cut within an apple just like a Jack O' Lantern. "Jack" in this saying is meant to reference how apples are often actually used as Jack O' Lanterns sometimes instead of pumpkins.
Look dude, instead of making fun of my cleft chin and saying how much it looks like a butt, how about you just call it a "Jack Apple Chin" instead?