Green’s Dictionary of Slang

boojum n.1

[from Lewis Carroll’s poem ‘The Hunting of the Snark’ (1876), with its last line ‘For the Snark was a Boojum, you see.’]

a person, esp. a moralist.

[Aus]Bulletin (Sydney) 22 Oct. 8/4: And wasn’t he the particular boojum who was going to make this a white man’s country, and no more darned coolies?