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!
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.