a joke. sorry if i offended u cuz ur mom may be ded. but still, ur mom. the best answer to any question.
teacher: whats the answer to number 7?
you: urmom
An internet term to shorten saying "Your Mom" Usually used in an internet insult on Reddit, Facebook, MySpace, Snapchat etc, Also typed in many chats of popular video-games, especially First-Person shooters like Halo, CoD, etc.
"Hey SH*TFACE I met Urmom @ a gas station and then we banged"