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A term people from Brisbane (Queensland, Australia) use to describe a female that has sex with anyone in return for drugs.
"Yeah I've heard about her, she's an onion so steer clear of her"
Onion by skattercrab October 1, 2013
Kid: "Hey mom, did you know that 1+1=3?" Mom: "That is the most Onion thing I have ever heard!"

"I can't believe he said that, that was so onion!"
Onion by In Odin we trust January 20, 2017
The girlfriend of a bikie or a member of a motorcycle gang. Note the similarity to the old English word "ronion", a term of contempt for a woman.
The word comes from Australian slang, but may have originated in the U.K.
The bikie came into the bar with his onion by his side.
Onion by Steven Guy February 8, 2009
1. During Sex, when a guy "comes" on a girls face, and makes her eyes water/cry.
Blake gave Kaycee an onion!
Emily and Krisha like onions.
Onion by ilovefishx November 23, 2010
Have layers; are like ogres
“Ogres are like onions. Onions have layers. Ogres have layers
Onion by Moto Moto is god March 31, 2019
someone who goes against the consensus of a group, generally used in political or intellectual discussions.
Person 1: "I love this book."
Person 2: "Me too."
Person 3: "It's not that great"
Person 1: "You are the onion of the group!"
onion by dr g class July 3, 2010