wah lao Share definition Flag Typically used in Singaporean context to exhibit frustration and in some cases, disappointment. Wah Lao! You claimed that it's going to be an easy job and after all the waiting, you are telling me you can't do it? wah lao by teundo March 8, 2017 0 0 Get merch Get the wah lao mug. Buy Now — $32.95 See more merch