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.
"Your Mom is so fat when she got on the scale it said, I need your weight not your phone number." Alec joked.
A comeback only 3-5th graders use because they think it will make them sound cooler than everybody else in the room.
Kid: Hey dude I think ur a total dumbass.
Other Kid: YOUR MOM!
Is a raging homosexual.
She told me last night when I attempted to bang her.
Whose that raging homosexual?
Your mom
Someone whose fiddle I diddled last night
I fiddled and diddled your mom last night
What every 12yr old says to every question you ask them.
Person 1: wuts up biches
12 year old: Your Mom. (Laugh)
If someone uses this on your your mom is gay
Your mom is stupid oh yeah well your mom is gay