the visible gap between a woman's breasts. Zero gap preferred, 1/2" is interesting, 3" is boring, 5" is too much.

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.

The reason I failed classes in high school.

The visible by-product when a woman wears a bra/corset/top that pushes her breasts together.
Sometimes used purposly as an attraction technique when tartish girls want shallow guys attentions.

One of the best things in life

Cleavage is the most important thing in the world for most men or they just don't care. Also you can compare it to the sun. You can't stare at it to long, it's to risky.

1. noun.
The gap between two soft entities on the body. Usually the cleft between a womans breasts. Also sometimes used to describe the anus' "Butt Cleavage", or even out of the ordinary, fat caused cleavage in other parts of the body such as the side rolls, or even "chin cleavage"... burr.

2. noun.
Any gap caused by an axe or wedge shaped (cleaver) object.

3. verb.
The act of cutting or slicing your enimies. Done with a meat cleaver or any wedge, one can deal out "unnatural" cleavage to whomever they please, male OR female. To have cleavage in this case means to have the ability for cutting and slicing.