The reaction to every single situation possible. The most versatile word in existence. Can be used to show happiness, sadness, distress, anger, fear, sleepiness, disgust, approval, disapproval, confusion.. and many more!
Example 1-
Girlfriend- Omg I'm preggo!!
Boyf- Bruh
Example 2-
Man- Dude I need to borrow some more money I'm broke.
Other man- Bruh