The phrase comes from everyday Turkish slang, where hadi bakalim is a common way to say come on, let's see, and olum is a casual way to address a friend. As a standalone clip it spread through short-form edits and soundboards because the meaning is clear even to viewers who do not speak Turkish, thanks to the tone alone. It is now used less as dialogue and more as a signal, marking the second before a dare, a fail or a confident attempt begins.