Your mum (maternal insult) is a (humorous) response to a question. It is usually meant as a joke.
Also known as entity 976. This is a term to describe obese or fat. This has been used by armed americans 8000 times at a minimum a day.
"Oh look its entity 976!"
"do you mean that obese 14 yr old?"
"Yes."
This defines the meaning of your mum in a very realistic way"
When I Greg come across any and all relation to your Mother and correlate it to something either insulting, or of sexual nature.
You: I walked to town today. Greg: I walked into your Mum today.