The phrase comes from everyday Turkish, where hoş geldin is the standard welcome said to arriving guests, and vay adds a note of amazed delight. In this longer, dialect-flavoured form, hoşgelmişsen sounds folksy and theatrical, which helped it travel as a standalone reaction clip on soundboards and in short video edits. Shared mainly for its expressive delivery rather than a specific film or show, it has become a go-to greeting sound in Turkish meme culture and is now reused by creators well beyond that audience.