Definition of "bruh"

bruh¹

noun
plural bruhs
1. (archaic) The rhesus macaque.
  Quotations
  […] in adolescence, and still more in youth, it is no less certain that the bruh is both good-natured and intelligent.
  1838, James Rennie, The Natural History of Monkeys, Opossums and Lemurs

bruh²

/bɹʌ/

noun
plural bruhs
1. (slang) Alternative form of bro (“male comrade or friend”)
interjection
1. (slang) Expressing amazement or shock.
2. (slang) Expressing a feeling that something is an exceptionally stupid or inappropriate thing to think or to do.
3. (slang) Expressing disappointment.