Saying this word will completely annihilate
The person ur speaking to.
John : fuck u
Bob : ur mom
John : dies
guy one what did u do last night guy 2 ur mom
specifically used as a sly response to people asking questions u don't know the answer to.
idiot #1: hey Joe, what's the state capital of Nebraska?
smarter idiot #2: ehem... ur mom.
It is a joke about your mom. It is used to insult peeoples moms. YOU MOM