A maternal insult (also referred to as a "yo mama" joke) is a reference to a person's mother through the use of phrases such as "your mother" or other regional variants, frequently used to insult the target by way of their mother. Used as an insult, "your mother . . . " preys on widespread sentiments of filial piety, making the insult particularly and globally offensive. "Your mother" can be combined with most types of insults, although suggestions of promiscuity are particularly common. Insults based on obesity, height, hairiness, laziness, incest, age, race, poverty, poor hygiene, unattractiveness, homosexuality, or stupidity may also be used. Compared to other types of insults, "your mother" insults are especially likely to incite violence. Slang variants such as "yo mama", "yo momma", "yer ma", "ya mum", "ur mom", "your mum", "ur mum", or "your mom" are sometimes used, depending on the local dialect. Insults involving "your mother" are commonly used when playing the Dozens.