Top Definition
An overly cool 1980's-1990's helmet made by Rosebank in Australia. Popular colours included fluoro yellow and green, white, and dusty pink. Parents were known to draw eyes on the back of the helmet to ward off the deadly 'magpie dive'.
Child is going for a bike ride.
Mother: "Don't forget your stackhat!"
by donkeyman01 July 31, 2008

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