The very slight and sexually arousing slit that appears when a woman is barely exposing just enough of her cleavage (also known as breasts, "titties", "honkers", "jugs") so as to entice straight men and lesbians. Can often be far more titilating (pun fully intended) than a woman exposing all her top half immediately.

When you eat dirt for the first time and leave your family to build a shack in the woods

A varied slang term used to substitute the word "Cleavage".