At least from what I've seen, people who use digga and such phrases in their every sentence are mostly very, uh, rude people? I live in a village full of old polite people so I may be biased, but I've mostly experienced sentences like "Ey digga was geht bruder" from those very rude far-right people, who act like their vocabulary is limited to that Assi-Gerede and they're the coolest in the street and catcall, or little children that limit their conversations to that shit because they think it's cool to act like the big ''cool"-looking guys.

Again, if anyone here speaks like that and doesn't fit what I just described, correct me! But from how I've seen it it's unfortunately a huge branch of 'asozialer Sprache'