“Walao” and its variations are popularly used when someone is surprised, shocked in disbelief. This would be the Malaysian & Singaporean
replacement of “
Oh my gosh!”. Malaysians typically use it when there are mega sales, cheap flight and hotel discounts on sale, whenever they get together at the mamak watching football, and so on. It’s also typically used to compliment one’s skills, talents or achievements - or if your friend does
something stupid!
There are also other names you can use with "Walao", such as "Walao eh", "Walao wei", etc.