Green’s Dictionary of Slang

my name is Twyford phr.

[proper name of Josiah Twyford (1640–1729), whose secret process for glazing provided the basis for his creation of a successful firm of sanitary potters; presumably his response to those who wished to elicit his secret]

I know absolutely nothing about it.

[UK]Farmer & Henley Sl. and Its Analogues.