It is widely used in Balkan countries (Serbia, Croatia, Bosnia and Herzegovina) in various contexts, from casual conversation to popular culture. Common Uses of "Što da ne"

Da means yes, and that's likely one of the first things you memorize once you start learning Serbian. Go Speak Serbian Bosnian, Croatian, Montenegrin & Serbian

Used when someone asks if you'd like to do something and you agree enthusiastically. For example, "Wanna grab a coffee?" — "Što da ne!" .

abcčćddžđefghijklmnoprsštuvzž Serbian-Croatian » English. English » Serbian-Croatian. Serbian-Croatian-English dictionary » How to Use Da in Serbian: Say Yes to Fluency

You will frequently see it in captions for vlogs or "Get Ready With Me" (GRWM) videos when creators try something new or spontaneous.