An innocent expression of surprise, expanding on the word 'wow'.
British English, similar in meaning to 'holy moly' in American English.
"You cycled all the way from Chippenham to Salisbury? Wowsers trousers!"
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A commonly used phrase in Sydney, Australia ('chook' is Australian slang for chicken), meaning a great idea. Normally an unusual or ingenious idea, solving some kind of problem.
"That's genius mate, Pince-Nez on a chook!"