Place it at the peak of a fail edit, just before the impact, then follow it with Scream Meme for the crash and Bruh for the reaction afterwards in your timeline.
About this sound
This clip, just over a second long, is a panicked male voice shouting 'Brian, look out!' and then stretching out a desperate 'Nooo!' as disaster strikes. It feels like a cartoon alarm going off at the worst possible moment, funny because the warning comes too late and the reaction is so over the top. It comes from JJJacksfilms.