green onion 

a person (normally female) with poor genital hygiene.

Chelsea forgot to wash her vag for 6 days, and she turned into a green onion.

green onion by Urs V September 28, 2008

cunt onion 

a girl with an extremely nasty smelling vagina

i stuck my fingers in that cunt onion

cunt onion by punkpirate August 29, 2005

Poser Onion

A poser onion is basically another word for "poser". It was derived from the Veggie Burger bags from A&W. The bag features three vegetables all smiling. One day, while partaking of this burger, it was discovered that the onion looked somewhat suspicious, and out of place looking the way he did. It was decided that he was a "poser onion", and anyone who was a poser, is also a poser onion.

Most emo kids are poser onions.

Poser Onion by Taylor Craig August 30, 2005

Spanish onion

When you start crying due to the Latin girl you're 69-ing sharting in your face.

Person 1: Hey, amigo, what's wrong?

Person 2: I had a Spanish onion last night, I cried for hours

Spanish onion by Dfell19 November 19, 2015

Ghetto Onion 

A large, well-rounded pair of buttocks.
(Looks so good, it makes you wanna cry.)

Damn, look at tha fine ghetto onion on J.Lo! I got tears in my eyes!

Ghetto Onion by Gourmet Princess April 24, 2003

CENTER OF ELLIES ONION

The act of a D1 college baseball player trying to CRUSH a female intern.

Scott wishes he could place his dick in the Center of Ellies Onion

CENTER OF ELLIES ONION by The Squid 3 October 23, 2009

Blooming Onion 

Placing one's fist into another's rectum (also known as fisting) and then proceeding to fanning open the hand and fingers, creating a blooming onion-like appearance.

I gave Kirk a blooming onion after he passed out.

Blooming Onion by Taylor, B November 12, 2005