the mother of all

the mother of all (something)

The largest, most extreme, or ultimate example of a particular kind of thing. The word that follows "of" is usually plural. Wow, that is the mother of all sandwiches. It's a foot high!
See also: all, mother, of

the mother (or mother and father) of all —

an extreme example or very large specimen of something. informal
2007 Michael Simkins Fatty Batter Our pet pug dog, little Oona, does the mother of all dumps on the flower bed.
See also: all, mother, of
References in periodicals archive ?
On December 9, 1531, in an area where much human sacrifice was then being practiced, the Virgin Mary said the following to Blessed Juan Diego: "I am your merciful Mother, the Mother of all who live united in this land, and of all mankind, of all those who love me, of those who cry to me, of those who have confidence in
Seven years later, in May of 1930 Our Lord explained to Sister Lucia of Fatima that souls offend and blaspheme against the Immaculate Heart of Mary by refusing to accept her as the Mother of all mankind.
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