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A thin flexible disk, usually made of rubber, that is stuck up in a woman's pussy so that it covers the cervix and keeps the boyfriend's sperm from gettin' to her eggs when he cums inside her, thereby keeping her from gettin' knocked up.
My girl forgot her diaphragm so I had to pull out and cum on her tummy (ass-crack, back, whatever).
by xr7 September 02, 2004
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The part of the human body that tightens and moves down to create lower air pressure in the lungs than in the outside environment, allowing air to move into the lungs. This part then relaxes and moves back up, generating higher air pressure in the lungs than the outside environment, forcing carbon dioxide out of the lungs. This part also separates the chest cavity (cardiovasuclar and respiratory) from the abdominal cavity (digestive system), which is why your chest expands as you breathe. Also that fancy part of an air horn that rapidly vibrates in response to air movement, generating that screeching sound.
(From Business Insider) "When you take a breath in, your diaphragm tightens and is pulled down to allow your lungs to expand. When you exhale, your diaphragm relaxes and is pushed back up to expel the air from your lungs."
via giphy
by Tornadopelt March 13, 2019
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A circular device usually made of rubber placed in a womens vagina to cover the clevis. It is used during sexual intercourse to protect her from getting the males sperm inside of her
She told him she liked to use a diaphragm during sex then a condomn
by Tarazz November 13, 2005
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