You might think expressions are universal, but think of the use of hands in speaking my Italian-Americans and you've realize there are differences. Without question the feet apart, hands on hips stance is a patented gesture of the African-American female showing her disapproval or disbelief. And we cannot forget the mere raising of an eyebrow, the subtle turning of a head in a certain direction, or the lifting of an arm to curtail an action while sitting in church. Speech patterns provide a wide range of colorful characters. The use of slang words are sometime prevalent.
Language is also different within setting.
At home there is a more relaxed method of communication than will be found in the workplace or in a mixed cultural environment. While phonetics or dialect is difficult to read and write, voice is clear and when set apart can be quite identifiable. Description can be easy or difficult to convey. Physical attributes can be anything. African-Americans run the full gambit of color schemes and features.