Wahlau Definition
interjection
(Singapore, slang) Wow! Oh my! (used in surprise and/or admiration).
Wiktionary
Origin of Wahlau
Said to be a derivative of the Hokkien phrase wah-lau-peh which literally means "my father!" From Hokkien 我老伯 (POJ góa lāu-peh)
From Wiktionary
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