Green’s Dictionary of Slang

haste, speed; esp. in phrs. on the jildi, in a hurry, quickly; move a jildi, hurry up.

1890		Kipling Barrack-Room Ballads (1893) 164: You put some juldee in it / Or I’ll marrow you this minute.
1915		Register (Adelaide) 29 Dec. 3/3: Tommy’s slang is largely derived from Hindustani [...] ‘put some jildi into it’ meaning ‘hurry up’.
1930		(con. 1914–18) Brophy & Partridge Songs and Sl. of the British Soldier 132: Jildi. — Quick, look sharp, hurry. Also used in the phrase ‘on the jildi’, e.g. ‘Get them bags filled on the jildi’.
1938		J. Curtis They Drive by Night 51: Put a bit of jildy into it for Christ’s sake.
1963		C. Wood ‘Prisoner and Escort’ in Cockade (1965) I iii: Get a jildi on – bahdin ... that’s what they say isn’t it?
1978		A. Burgess 1985 (1980) 156: If you want to phone you’d better put some jildy in it.