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.
by JJ_JUGBALLSJONES April 17, 2015
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