Bomboclaat, also spelled bumboclaat and shortened in variants like bamboclat, comes from Jamaican Patois, where it is a strong swear and exclamation of shock or anger. Online, the word moved from dancehall and reggae culture into caption memes in the late 2010s, where photos were paired with the term for comic disbelief. Short audio clips followed on video platforms and soundboards, with creators reusing the shout as a ready made reaction that needs no setup or explanation for viewers familiar with the meme.