The phrase comes from Borat, the 2006 mockumentary comedy starring Sacha Baron Cohen as Kazakh reporter Borat Sagdiyev, a character first developed on Da Ali G Show. Borat uses 'wa wa wi wa' as his mangled expression of amazement, most famously when impressed by women or luxury. The line became one of the film's most quoted catchphrases alongside 'very nice' and was clipped endlessly for forums, early YouTube edits and soundboards. Its short, unmistakable delivery keeps it alive as a reaction sound long after the film's release.