A word that many people use when they're in shock, or when someone does something stupid. Usually used by many teenagers, and is used in many memes. (You can really use this word for anything but just giving some examples.)
Dude: how does one even get on top of the fridge, bruh.
Dude 2: how did Steve even throw that ball so high up? bruh.
Dude 3: why is he so stupid, bruh.