Eighty Six: to throw out, or no longer available on the menu, or to refuse service to a customer (American)
Example: A reference to article 86 of the New York state liquor code which defines the circumstances in which a bar patron should be refused service or "86ed"
Elvis has left the building: the show or event has ended, this comes from the announcements that used to be made at the end of, or It's all over.
Example: All right, Elvis has left the building. I've told you absolutely straight up to this point. You know that. He has left the Building.
Ethnic Cleansing: a systematic elimination of an ethnic group or groups from a region or society
Example: More than 100 are killed as a wave of sectarian. An ethnic cleansing has swept across Syria this year.
Every cloud has a silver lining: Be optimistic, every difficult or unpleasant situation has some advantage
Example: Don't be unhappy that you are failing your interview. You will see, every cloud has a silver lining.
Everything But The Kitchen Sink: Almost everything and anything that is required or considered
Example: He has on everything but the kitchen sink, and also his future looks bright!
Excuse my French (or Pardon my French): an attempt to excuse for using a foreign language that may be considered offensive
Example: Excuse my French, but this is a hell of a day.