The peak of human laziness. When a human is so lazy that they make a unsophisticated noise because they are slowly losing the ability to speak normal english
Bill: I got an Iphone
Bob: bruh
Bill: I dropped my Iphone
Bob: bRuHhH
Bill: Only idiots say Bruh
Bob: bBrRuUuHhHhHhHhHhHhHhHhHh
Anybody who searches up this word on urban dictionary
Fred: oOoOhH hEhE wHaT iF i sEaRcH uP dUmBaSs On uRbAn dIcKsHiOnArY
Bill: 1: it makes you a dumbass
2: u spelt that wrong fucking retard