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1.
The one word you never want to hear in a dentist's office. A cavity develops when a tooth decays or breaks down by bacteria. It is a hole that can grow bigger and deeper over time, even if you brush and floss regularly. If you have a cavity, it's important to get it repaired, as brushing and flossing will not remove away the cavity. If left untreated, it can cause a lot of pain and discomfort. It can spread to the root area and cause an abscess (infection). This infection can then spread throughout the head and cause severe damage. If this goes untreated, it could even cause death.
Patient: "Well, how are my teeth, Doc?"
Dentist: "Oh, my! Son, you have a cavity! Looks like I need to numb your teeth and put a very big drill to remove the soft part of your teeth. Don't worry. You won't feel a thing."
Patient: "Lies!"
by pictouch March 18, 2013
 
2.
The space between a woman's breasts, beyond her cleavage, usually when there is a very little gap between her breasts. The woman usually has DD or larger breasts. This term only applies to natural breasts.

The cavity is the place where she stores stuff, like a man's pockets, or a woman's handbag, but at absolutely no cost whatsoever.
Sally had an open top, exposing her natural F-size breasts. The corset she wore exposed a lot of her cleavage, which had barely any gap between the two.

Sally looked left and then right before placing her phone inside her breasts. While her hands were there, she pulled the two apart, and pulled out a small notepad and a pen.

She placed her notepad on her chest and began writing, before pulling the two apart again and pulling out some liquid paper. When she finished using the liquid paper, she placed it back inside her breasts.

When she finished writing, Sally placed her notepad and pen inside her cavity.

Half an hour later, Sally pulled out a 600mL drink bottle and started drinking, before placing it back into her cavity.

When she met with her boyfriend, all of this was still in her cavity, yet he saw none of it, as it was all stored in her cavity.
by The Definite November 07, 2009
 
3.
a place to go strollin'
karlos: "dude, have you been strollin'?"

colin: "yeah bra, been strollin' in the missus' colon cavity"
by the rompster March 05, 2010
 
4.
As Mitch Hedberg put it, a place to put stuff.
"'Do you know where I can store a pea?'
'Yes, I have some spaces available.'"

cavity
by Odin Ni November 09, 2005