Green’s Dictionary of Slang

(orig. milit.) used in a variety of negative senses to mean done with! nothing doing! go to hell!

1890		Kipling ‘The Story of the Gadbsys’ in Soldiers Three (1907) 151: The thing has come to an end on my side. That’s all. Mafisch!
1915		I.A. Williams diary 1 Aug. 🌐 Nothing today again ‘Ma Feish Falouse’. [...] 7 Aug. I did not go anywhere today, as I am ‘Ma Feish Falous’ again.
1916		C.J. Dennis ‘A Gallant Gentleman’ in Chisholm (1951) 63: ‘Look after Rose,’ ’e sez, ‘when I move on. / Look after... Rose ... Mafeesh!’ An’ ’e wus gone.
1925		(con. WWI) Fraser & Gibbons Soldier and Sailor Words 150: Mafeesh: (Arabic). Dead. Done with. Finished [...] It had other meanings: ‘I can’t’, ‘I know’, ‘Get out’, ‘Go to hell’, and some meanings that are unprintable.
1930		(con. 1914–18) Brophy & Partridge Songs and Sl. of the British Soldier.
1967		‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxvi 4/1: mar feesh: Finish, the end, that’s final.