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yay
size as indicated by hand gestures: Use a piece of wood about yay big to chock the wheel.
Contributor's comments: My understanding of this word was that it was spelt Yea and came from the older version of yes - so a piece of wood yea big would be accompanied by a hand gesture to indicate yes that's the right size. I haven't encountered anyone who didn't understand yea big in fairly wide travel throughout Australia.
Contributor's comments: Also a term used in Nth Qld - Yay big, Yay far, Yay long. Usually used in reference to distance, length or volume rather than weight.