a word, phrase, or expression that is considered to be coarse, inelegant, and inappropriate, especially one that refers to sex or bodily functions in explicit or offensive terms;
e.g. Every line of dialogue in the movie contains a vulgarism, so it definitely isn't appropriate for children.
(noun)
some action or behavior that is rude, offensive, and vulgar;
e.g. You cannot engage in such a vulgarism in polite society.