see brass farthing under brass adj.1
SE in slang uses
mean-faced, pinched features.
|Chequers 80: Garn, you farthin’ face! Shet your neck.|
|Down Cobbled Streets, A Liberties Childhood 127: ‘You’ve a little farthin’ face,’ she would declare as she wound the rags around my stubborn hair.|
|My East End (2000) 79: My father’s generation of East Enders – he was born in 1919 – do not speak the dull, uniform, flat-vowelled Estuary English [...] He will still use what is essentially Victorian idiom – phrases such as ‘daddler mooey’ and ‘fard’n face’.|
the smallest available portion of ice-cream as sold by street vendors.
|Sunderland Dly Echo 4 July 2/8: The ‘hokey-pokey,’ ‘farthing taster,’ and so forth [...] sold by ice-cream vendors [...] are pepared in filthy hovels.|
|(ref. to 1870) in Passing Eng. of the Victorian Era.|