Green’s Dictionary of Slang

flummoxed adj.1

also flummuxed
[flummut n. + fig. use of flummox v.; in tramp jargon flummoxed refers to a place that is unsafe to visit, the owners or guardians are likely to have one imprisoned]

(UK Und.) imprisoned for one month.

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[UK]Salisbury & Winchester Jrnl 15 Oct. 7/4: Beggars’ Marks [...] Flummuxed (dangerous) sure of a month in quod.
[UK]Hotten Dict. of Modern Sl. etc. 40: FLUMMUXED [...] sure of a month in quod, or prison.
[UK]Hotten Dict. of Modern Sl. etc. [as cit. 1859].
[UK]Sportsman (London) ‘Notes on News’ 3 Feb. 4/1: It is to hoped [...] for the good of the Peckham community [...] that the tramps, to use one of their own strong exproiaions, will soon be ‘flummuxed’.
[Aus]Crowe Aus. Sl. Dict. 29: Flummoxed, done up; sure of a month in prison.