Could be an adjective for things that are incredibly awesome. Can be a placeholder for bruh. Or, alternatively, a placeholder for poggers. Really, it works anywhere as long as you think it works.
“Dude, this pizza is so bruggers!”
“Yeah, man. I love it.”
When someone does something dumb, but neither 'bruh' or 'nigga' with a surprised denotation cuts it, and you need to pull the big guns, or you're white and in public.