Alternative form of everybody and their dog

Alternative form of everyone and their grandma

Alternative form of everybody and his grandma

(idiomatic) Everything someone uses or does succeeds or becomes better.

(idiomatic, vulgar, derogatory) Everything someone uses or does fails or becomes worse.

a polite closing of a letter

(Internet slang) Used to refute or express doubt in the veracity of an anecdote.

(probability theory) An event that contains no possible outcomes and thus cannot possibly occur; an empty set.

(probability theory) An event that contains all of the possible outcomes and thus is known a priori to be certain to occur; the entire sample space.

Wearing an evening gown.