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In page Vulgarism:

"

a peculiarity which intrudes itself into Standard English, and is of such a nature as to be associated with the speech of vulgar or uneducated speakers. The origin of pure vulgarisms is usually that they are importations, not from a regional but from a class dialect—in this case from a dialect which is not that of a province, but of a low or uneducated social class. ... [A vulgarism] is usually a variety of Standard English, but a bad variety.[2]