The line comes from the Polish language version of Call of Duty Warzone, where BSP is the Polish abbreviation for an unmanned aerial vehicle. Announcer warnings like this became familiar soundboard material because they compress a whole tactical situation into one clear callout, similar to Enemy Spotted and bomb has been planted in other shooters. Polish players shared the Warzone version in clips and edits, and its short ping and serious tone helped it travel beyond matches as a general overhead danger joke.