Green’s Dictionary of Slang

do you understand (what this is/what’s happening)?

1880		Bulletin (Sydney) 13 Nov. 4/1: Johnston [...] says the lighthouse keepers need words of comfort. He says they must be words of grace. Twiggez vous?
1892		Morton & LeBrunn [perf. Marie Lloyd] in Twiggy Voo? 🎵 Twiggy voo? my boys, twiggy voo? / Well of course it stands to reason that you do. / All the force and meaning in it / You can ‘tumble’ in a minute.
1907		Marvel 2 Feb. 46: Twiggez-vous, Roy?
1909		J. Ware Passing Eng. of the Victorian Era 4/1: Ah, que je can be bete! (Half-Soc., 1899). A new macaronic saying – French and English. Amongst the lower classes another ran ‘ Twiggy-vous the chose?’.
1953		J. Franklyn Cockney 136: Twiggy vous?