Just Here For The Zipline

The line comes from Tim Robinson's Netflix sketch show I Think You Should Leave, where the character Ronnie flatly accuses someone of only being around for one specific reason. The sound picked up steam because of the boom effect that lands right after the accusation, which turns the joke into a two step reveal, first the callout, then a blunt confirmation that the accusation is true. It's been widely reused across dating and lifestyle content, including a lot of Love Island fan edits, which is likely where the association with the show comes from.