'Bruh moment' is a blanket term for all situations that merit a reaction, whether that be shock, awe, or any other strongly felt emotion. In these such situations one must exclaim 'Bruh!', typically in a low tone of voice. Typically only men will exclaim using the word 'bruh', however, the S.O.B. (Society of Bruh) is a progressive union full of verified gamer bros and care not whether man nor woman exclaims with the word 'bruh'.
An urban expression which describes an embarrassing event or compromising situation. A speaker uses "Bruh!" to punctuate his disappointment and/or disgust at the specific event or situation. It's the inner-city equivalent to "Omfg!" (teenaged girls), "Seriously?!" (gay men), "Holy shit, bro!" (white boys), or the ghetto's own "SMDH."
(Bruh Moment: Marquise finds Darnell passed out next to a toilet, having thrown up and shitted all over himself.
MARQUISE: Bruh!
(Bruh Moment: Tyrone misses a wide-open layup.)
AUDIENCE MEMBER: Bruh!
(Bruh Moment: Little homey enters the room sporting wack-ass haircut.)
MAN 1: Bruh! Who da fuck cut yo damn hair?!
(Bruh Moment: Thot enters Jerome's house, looking about 200 lbs heavier than she does on her Instagram pictures.)
JEROME: Bruh!
JUDGE: Mr. Farmer, the court sentences you to 7 years for felonious assault.