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Mary Jane Rotten Crotch 

Gunnery Sergeant Hartman's description of a promiscuous girl, one that may or may not be a soldier's girlfriend prior to his military service. The term originated in the 1987 movie FULL METAL JACKET, and was used to describe the difference between a Springfield M-14 rifle used during basic training, and a female human, to the Marines being trained.
Gunnery Sergeant Hartman's dialog during the movie FULL METAL JACKET (1987):

(Shouting): "Tonight, you pukes will sleep with your rifles. You will give your rifle a girl's name. Because this is the only pussy you people are going to get. Your days of finger-banging old MARY JANE ROTTEN CROTCH through her pretty pink panties are over. You're married to this piece, this weapon of iron and wood. And you will be faithful."

crotch goblin 

A child. Also known as crotch spawn, or runny nosed shrieking brat. Essentially, a baby or small child that is a whining little hell demon. Elementary schools and daycare centers abound with crotch goblins.
"Someone shut that screeching crotch goblin up!"
crotch goblin by Juke Joint Jezebel September 30, 2005

Crotch Check

The act of checking the crotch of your pants for durability before you put them on to avoid an embarassing blow out.
Me: Did you see her crotch?

You: No! What happened?

Me: She must not have done a crotch check this morning because she just had a blow out!

You: That's like the 4th pair she has blown!
Crotch Check by **MAT*** March 30, 2011

Crotchfidence 

Confidence stemming from the power held within one's crotch, often because of the largeness of one's trouserworm.
Wow, Matt Cameron of Soundgarden and Pearl Jam sure has lots of crotchfidence.
Crotchfidence by elementary-son September 7, 2012

Crotcheral vicinity 

The area below the belly button and above the thighs
We’re you bleeding from your crotcheral vicinity?

crotch pheasants 

noun (plural), colloquialism: crab lice, pubic lice
"I'd stay away from that chick, bro. I hear she's got crotch pheasants."