it's very clear. it's your mom-
yooo ur mom is hot
damn i want ur mom to rail me!
used as a method to abort a heated argument when you have no comebacks left. most popular on XBox live, where it was founded.
Person 1: "3 dollar hairline"
You: "ur mom"
Basically an comeback, like "no u".
Most jokes including "ur mom" is like;
"Ur mom gay"
"Ur momma so fat that she ________
Person 1: You're so fat.
Person 2: ur mom.
If your friend said this to you, you just got got
They say sex and gender are the same thing but I don’t remember having gender with YOUR MOM last night
Dad: How was last night ur mom loved it
Son: What was that weird sound she made
Every 7 year olds favorite two words; the most "savage" words on planet earth.
Henry: this is why you're adopted
Brian:ummmmm...ur mom
Every other kid in the room besides Henry: OHHHHHHHHHHHH