It's a German word mostly used in or around Hamburg which has absolutely nothing to do with the word nigger!
It's said that it was used by dockers in Hamburg for the first time and was later adopted by the Hamburger Hip-Hop Wave in the early 90s!
It has the same meaning as the English "mate", "dude" or "bro" depending on the context!

German slang, similar to 'dude' in english.. comes from the word dicker originally. dicker literally means fatty but in german is used as 'dude' or 'bro'
dicker -> digga = same thing
NOTHING TO DO WITH THE WORD NIGGA/NIGGER IN ENGLISH!

Also Dicker, Digger, Diggah or Diggha is a german phrase, that is the equivalent to the english term bro, dude or homie.

In the german language you can describe someone as "dicker Freund" which literally translates to "fat friend" but actually means "close friend"; so a "Dicker/Digga" is a "close one"

The "ck" in Dicker changed to the "gg" in Digga because of the Hamburg dialect. Further the word was popularized by the hip hop culture of northern Germany in the early 90s and is today used all over the country especially in Berlin.

The german word is a positive one and has nothing to do with the american derogatory term "ni**er“

german term which got absolutely nothing to do with the word nigga!
came up at the mid/late 90s german hip hop wave.
mostly used by north-german (hamburg) rappers like "das bo".

german term which got absolutely nothing to do with the word nigga!

came up at the 90s german hip-hop in Hamburg

mostly used in hamburg rappers like "Samy Deluxe" and "E-KNOCK"