The southern US is the focal point for words like "bruh" and "ima" (and its orthographic variants i'ma and imma), while "hella" is centered in California and "rad" in the Pacific Northwest. "Wicked" is more characteristic of New England (especially Massachusetts), but less strongly than the others (perhaps because of its polysemy - its meaning as "very" is likely a regionalism but its older sense of "evil" is almost certainly not).His methodology is also pretty interesting.
Using Twitter...for good?
This post about geographic slang disparity via Twitter is awesome. He writes: