Definitions of vulgar:

• adjective:   of or associated with the great masses of people

  Example: "A vulgar and objectionable person"

• adjective:   being or characteristic of or appropriate to everyday language

  Example: "The vulgar tongue of the masses"

• adjective:   lacking refinement or cultivation or taste

  Example: "Appealing to the vulgar taste for violence"

• adjective:   conspicuously and tastelessly indecent

  Example: "A vulgar gesture"