Green’s Dictionary of Slang

flummut n.

[tramp/tinker use, flummut, a mark placed on a door to indicate a house that will be unfriendly; ult. flummox v.]

a one-month prison sentence.

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[UK](con. 1840s–50s) H. Mayhew London Labour and London Poor I 218/2: ‘Flummut,’ sure of a month in quod.
[UK]Answers 20 July 121/ 2: If you want to get rid of an importunate tramp tell him to stow his patter, or you will get him a flummut [F&H].