A dated british expression indicating that something is good.
Spitfire pilot one: "That was hairy, managed to shoot down a couple of Huns in 109's though"

Spitfire Pilot two: "Whizzo! Bloody 109ers got tommy last week"
by GoldenOldies November 16, 2016
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Someone that is stupid, or doesn't do any work.
"Hey, you guys want to go drinking?"
"Shut the fuck up and do your fucking work, you whizzo!"
by January 12, 2021
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