"Bruh" is a popular variant of the slang term "bro" that is often used as an interjection to convey frustration or disappointment at something. Online, the term is frequently iterated in the forms of text comments and reaction images, as well as Vine remixes in which various subjects are shown fainting or falling over to the ground. Origin
"Bruh" has been used as an alternative way of saying "bro," an informal term of address for "brother," since the mid-to-late 2000s, around the same time or shortly after the word "bro" entered colloquial usage in American-English vernacular. On December 19th, 2003, the first Urban Dictionary entry for "bruh" was submitted by LudwigVan.