bruh Share definition Flag A singular word which is often used when a person is left speechless. The evolution of the word dude in the modern age. Alternate spelling : brah 1 : Hey, man, did you Don't Hug Me I'm Scare 4? 2 : No... 1: BRUH. bruh by Scarlet Diliges April 3, 2015 Get the bruh mug.