Someone who believes they've got the answer to every
question even if the
question hasn't been asked or if they really
don't have the answer (... but of course they believe they do). This is not a shy individual, but rather someone whose ego is over flowing primarily through their mouth, but seems to have come from the other end of their digestive system.
Standing in the
door of his single
wide, Mr. know it all gave me his latest real estate tips.
Mr. know it all told the
CIA there were weapons of mass destruction in Iraq. Unfortunately, they were listening.