Definition of "foh"

Offence? As I'm a Perſon, I'm aſhamed of you—Fogh! how you ſtink of Wine! Dee think my Niece will ever endure ſuch a Borachio! you'r an abſolute Borachio.

1700, [William] Congreve, The Way of the World, a Comedy. […], London: […] Jacob Tonson, […], Act IV, scene x, page 62

"Foh!" said Madame Mantalini, "how he ever gets into a carriage without thinking of a hearse, I can't think. There, take the things away, my dear, take them away."

1838 March – 1839 October, Charles Dickens, “Miss Knag, after doating on Kate Nickleby for three whole Days, makes up her mind to hate her for evermore. The Causes which lead Miss Knag to form this resolution.”, in The Life and Adventures of Nicholas Nickleby, London: Chapman and Hall, […], published 1839, page 169