The phrase comes from Polish viral videos of a man reacting with shock and swearing after spotting a beaver, with bóbr being the Polish word for the animal. Clips of the encounter were remixed repeatedly online, turned into songs and sped-up edits, and spread beyond Poland through TikTok and meme pages. The contrast between a quiet nature moment and the overblown swearing made it easy to reuse for other animals and surprise sightings, which helped the song version stay in circulation as a reaction sound.