A great insult to fling at people. Or just something to say when there is nothing
else to fill the void. Also, the source of many dirty jokes.
A) "Yer mom is so -insert insult here-
B) Person 1: "Hi, how are you?"
Person 2: "Yer mom!"
C) Person 1: "Hey, you poked a hole in my balloon! I hate you
Person 2: "I poked a hole in your mom