Beyond Cleavage: The Golden Age of Innerboob, Sideboob, & Underboob
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It’s basically impossible to keep up with the terminology used to exactly describe what part of a woman’s breasts are visible to the world. And if you don’t know what words to use, how can you properly describe exactly which part of that part of you looked so phenomenal the last time you rocked it? In order to right that wrong, we’ve laid them all out for you here.

cleavage
definition: “cleave” usually allows for just a hint of that nice stuff below, but sometimes, a cup can runneth over. The word refers to the literal line between the two breasts that can occur if the boob owner is particularly well-endowed. Also known as “decolletage” by classy bitches and old men or “frontboob.”
origin: Cleavage is the classic. Helped by a supportive and/or push-up bra, cleave was a big deal in the 1950s, when the so-called “hourglass” silhouette was popular. Corsets helped too.
popularized by: Everyone, but Jayne Mansfield helped.

innerboob
definition: When just the two inner sides of the breasts are visible, often with a peak at the bottom of the breasts. There is a clear separation between the two breasts – i.e. no cleave – and no bra is visible. Some on the Jezebel staff have decided innerboob should be called “throob” but this author does not condone the popularization of that word.