The phrase combines bomboclat, a Jamaican Patois expletive used for shock or annoyance, with wallahi, an Arabic expression meaning I swear to God. Put together, it sounds like an over the top oath of disbelief, which is why the clip travels as a short reaction meme rather than a full song or scene. Short vocal bursts like this spread through reposts, edits and soundboards because they can be reused out of context, and this one is often paired with stunned faces and fail moments.