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Idaho Diamond 

When a penis becomes abnormally hard. This only occurs when a man is so turned on that he cannot think straight and becomes light headed. It is usually at the climax of an orgasm. It begins with light grunting but eventually leads to loud and sharp screams. An Idaho Diamond also has the potential to rip the skin of an anus when inserted beforehand. It is called an Idaho Diamond because the erection is as hard as a diamond.
Last night was amazing, Robert gave Tommy the Idaho Diamond of a lifetime.
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The Diamond 

The diamond of chastity is a phrase used to teach the youngsters of todays world the importance of a chaste relationship. A female diamond is the area (in the shape of a diamond) from her neck to her knees. A male diamond is in the area (once again in a shape of a diamond) from his belly button to his knees. As the saying goes, "Do not touch the diamond unless you are wearing a diamond," referring to, of course, being married.

The common hand motion of making a diamond in the air is highly understood as the international symbol for staying chaste.
Two girls riding home with one of the girls dad after a volleyball game:

Tatum: "Oh my god! Lisa is that girl that went to third base!"
Melody: "Lisa isn't as slutty as that girl Jen, she went all the way home!"

Dad: "Tatum do you remember what the shape of a baseball field is like?"
Tatum: *sigh* "Yes dad, the diamond."
Dad: "Thats right!"
The Diamond by tatum&melody December 14, 2008

Tara Diamond 

if you are caught doing a Tara Diamond this means that you have been caught masterbating to a friend on facebook
tara diamond:
dude were you jerking off?
wtf is that my sister on the screen
Tara Diamond by chris brusalis December 19, 2006

old diamond

An ex girl friend you still love, and still have somewhat of a relationship
"Even though Ashley, broke up with me, I still kick it with my old diamond."
old diamond by Datpifff90 August 31, 2012

love diamond

Colloquial term for a woman's vagina.
"Hey baby, tonight I'm going to be making my way down south and nourishing that love diamond of yours."
love diamond by Peppy Shaken September 25, 2013

Black Diamond 

A drug made with a mix of five hour energy, weed, and meth. All to be mixed together and inhaled using cigarette paper or A bong
Dude #1: let’s smoke that black diamond!!!
Dude #2: For sure, bro.
Black Diamond by HagGahher June 18, 2018