Note how when used, it will cause the person you're talking with to automaticaly have sexual thoughts about his mother.
You: ur mom is tight
Random: i'm eating buffalo wings, it's dirty as I type but I really like wings
You: ur mom like it dirty
Random: brb bathroom
Random (several minutes later): back, was a bit long, was out of wiping paper lmao
You: me too but ur mom wiped me
"Ur Mom was a great sandwich! Oh! Diss!"
Defenition 2: If one can't think of a cool come back. This is the phrase to use.
Guy 2: "UR MOM makes cool sound effect!"