Green’s Dictionary of Slang

chubbarow! excl.

[Hind. chup raho, shut up]

(Angl-Ind.) shut up! be quiet!

[UK](con. WW1) P. MacDonald Patrol 20: ‘Chubbarow, Abie! [...] Leave the pore bleeder alone’.
(con. late 1940s) G.M. Fraser Sheikh & Dustbin (1997) 42: ‘Chubbarao and listen to this,’ said the Adjutant.