What does the phraseya mum mean?

The phrase "ya mum" is a colloquial expression often used in English-speaking contexts, particularly in the UK and among younger audiences. It's typically employed as a playful or teasing retort in banter, often as a part of "yo mama" jokes, which humorously insult or poke fun at someone's mother. While it can be lighthearted, it may also be perceived as disrespectful depending on the context and the relationship between the individuals involved.