The time component of this word is very important. All bad events that occur must happen within 24-48 hours from the first misfortune...unless you really get murphied and the time component is prolonged x hours.
James: No man that chick is mad ugly she was all over me but we didnt hook up.
Brian: wait but i heard you did?
James: No man if i did it was cuz i was hammered and i dont remember.
Rob:Dude you totally just Murphied us.
Person B: He really Murphied you