The letters in 'The Mother of all BS' can be reduced to Heteroatoms.
It can further be reduced to heartfelt.

The letters ultimately can be re arranged;
There are many possibilities but they are curiously about Amos

Amos Barfed Hell Troths
Amos Blathers Hold Fret
Amos Ballets Herd Froth
Amos Bra Threshold Felt
Amos Brats Frothed Hell
Amos Shafted Herb Troll
Amos Farted Throb Hells
Amos Thread Bells Forth
Amos Daft Brothers Hell
Amos Hard Brothels Felt
Amos Dollar Herb Thefts
Amos Fathers Berth Doll
Amos Lethal Bred Froths
Amos Halters Bled Forth
Amos Halters Bled Forth
Amos Halters Bled Forth
Amos shafted herb troll