Slang, Common, Vulgar, Local Manners, Local Customs, Mundane
adverb, noun, な adjective, の adjective
Things that are vulgar are things like slang, local manners, and just plain common stuff.
ぞく
The reading is the same as the one you learned with the kanji.
貧乏から金持ちに成り上がった人は、俗に成金と呼ばれます。
People who went from rags to riches are commonly called nouveau riche.