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Australian slang for rock, stone or pebble, or a small hardened rock shaped piece of dried mud or clay that shatters when you throw, bung or chuck it against a wall leaving a small piece stuck to said wall with the remainder being obliterated. Originating in the Gippsland region of Victoria, Australia in the late 1960's to early 1970's. Very often used in the town of Moe.
Hey Scott, bung a yonnie at the wall mate.

I saw Danny chuck a yonnie at the fence.
I bet that window will break if you fling a yonnie at it.
Yonnie by Jason Veenman April 17, 2015
Related Words
In the Netherlands and Belgium "Yonnie" is slang for someone who is glued to his game computer.
You spend too much time on the computer, you really are a "Yonnie".

If you look at the screen any longer, you might get "Yonnie-eyes".
Yonnie by anonymous November 21, 2021
CHRIS AND YONNIE IS SIGNED A SHEET CALLED DEATHROW
Yonnie by hissss lady February 13, 2023
CHRIS AND YONNIE ARE ON DEATH ROW
yonnie by hissss lady February 13, 2023

Yonnie's Depression 

Is when you have been married multiple times and have multiple problems. Usually from your first failed marriage that carry over to your other relationships which you never fully recover psychologically leading into Yonnie's Depression
Yonnie's Depression by The Fury November 14, 2018

lil yonnie

A creature that plays Fortnite in the morning with a mic when nobodys home. Come night time when someone is home he no longer has a mic and steals your loot.
lil yonnie is at it again stealing loot.
lil yonnie by The Fury November 14, 2018