Bruh

It is a word commonly used to refer to a friend mostly towards a male, or an expression towards an illogical or horrendous situation, question, sentence, etc., it's use started around the early 20th century originating from the English word brother, used often by African American's slowly turning into 'brer' and 'brah' and now as 'bruh'.

E.g.,

Tommy: My bicycle was stolen so I had to take the subway and arrived late for class.

Charlie: Bruh.