The phrase comes from informal Turkish speech, where noluyo is a shortened form of ne oluyor, meaning what is happening, and lan is a familiar slang address used between friends. The clip circulates as a short reaction sound on meme and soundboard sites, where Turkish-speaking creators use it to punctuate confusion, surprise and disbelief. Its appeal comes from the natural, unscripted delivery and the instantly recognisable wording, which works even for viewers who do not speak Turkish because the tone alone signals that something strange has just happened.