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Showing one of your testicles out of your pants to insult someone or showing a woman that you do have balls.
Example 1 : Gazza : What's up with the fella's behind us? They seem pretty pissed.

Soles : I gave them an onion.

Example 2 : Mick showed the onion to Jess and she loved it when a guy shows her that he's all balls.
by MSoles7 January 17, 2011
term that refers to a hott piece of ass of any age who makes an appearance at fast food restaurants; always of the female persuasion.
dude 1: "man, did you see that onion?"
dude 2: "was she a blooming onion?"
by inlovewithlaugh January 14, 2011
an insult the cockney equivelent of a twat.
from the mighty boosh:
vince noir:"he's melted"
The Hitcher:"i ain't meltrd you ONION im over 'ere!

me: (aside) nice one boosh
by eoghan the great June 04, 2007
A slang alternative for testicles.
Lando Calrissian: "Why, you slimy, double-crossing, no-good swindler. You've got some huge onions comin' here, after what you pulled." (feints, laughs) "How you doin', you old pirate? So good to see you!"
by OMGDINOSAURSWOW September 14, 2010
an emotion somewhere between sadness, frustration and anger usually characterized by being confronted by a problem or situation which you have no capacity to resolve or overcome.
Ex 1. There are 50, 000 gallons of oil draining into the ocean in the gulf of mexico daily. It feels like onions.

Ex 2. When my boyfriend sold my priceless collection of pokemon cards on ebay, without telling me, for money to buy cigarettes, it felt like onions.
by p@$$ing thr.ugh May 31, 2010
the essential part of quizon's notorious baja chicken
Lady: Hi! What can I get for you?
Hungry Guy: I would like a large baja chick with EXTRA onions!
by MattBizzle November 13, 2008
bomb ass weed. point blank, period.
"whatchu been up to, son?" "shit, man. i been shoving HEAVY onions." "oh yeah? spark it up."
by Yaya February 26, 2012