Source : Webster's Revised Unabridged Dictionary (1913)

Vulgarism \Vul"gar*ism\, n. [Cf. F. vulgarisme.]
   1. Grossness; rudeness; vulgarity.

   2. A vulgar phrase or expression.

            A fastidious taste will find offense in the
            occasional vulgarisms, or what we now call
            ``slang,'' which not a few of our writers seem to
            have affected.                        --Coleridge.

Source : WordNet®

vulgarism
     n 1: an offensive or indecent word or phrase [syn: {obscenity}, {dirty
          word}]
     2: the quality of lacking taste and refinement [syn: {coarseness},
         {commonness}, {grossness}, {vulgarity}, {raunch}]