Green’s Dictionary of Slang

scowbanker n.

also skowbanker, skullbanker
[dial., lit. one who scours or wanders the banks; Partridge and OED offer alt. etys. but the EDD ety., used here, seems obvious]

(orig. Aus.) a rogue, a rascal, one who loiters around in the hope of hand-outs, which will save him from earning a living.

[South Eastern Gaz. 27 June 5/1: It appears that the m en employed by Messrs Balston [...] are termed ‘Society men,’ whilst the men employed at Mr Giles’s [...] are classically termed ‘scowbankers’].
Hobarton Guardian (Tas.) 18 May 3/6: When some person attempted to interfere, one of the defendants said ‘Now you be quiet, for you're only a scowbanker’.
[Aus]Argus (Melbourne) 11 May 6/2: I hope and trust the working community will not be apathetic, but show by their votes that they wish to support liberal men, but not scowbankers, loafers, and spungers on society.
[UK]Hotten Sl. Dict. 233: SKOW-BANKER, a fellow who loiters around the premises of anyone willing to support him without the necessity of his working for a living; a rogue, a rascal. Common in Melbourne, Australia.
A Michie Retrospects and Prospects of the Colony 9: A skull-banker is a species of the genus loafer – half highwayman, half beggar. He is a haunter of stations, and lives on the squatters, amongst whom he makes a circuit, affecting to seek work, and determining not to find it.
[UK]Bucks Herald 24 Aug. 5/3: I heard several calling complainant ‘scowbanker’.
[Aus]Bulletin (Sydney) 6 Mar. 1/4: [It] is a testimony to [his] capability in a difficult branch of literary work, and […] he can well afford to laugh at the opposition of the scowbankers of the colonial Press, whose praise or censure can be purchased for a crown.
[Aus]C. Crowe Aus. Sl. Dict. 74: Skowbanker, a fellow who lives on others and won’t work.
[US]A.J. Boyd Shellback 191: What he don’t know in the way of workin’ up a crew of scowbankers ain’t worth knowing. [Ibid.] 229: You white-livered ’longshore loafers! You ---- mutineering scowbankers!
[Aus]Stephens & O’Brien Materials for a Dict. of Aus. Sl. [unpub. ms.] 133: SKULL-BANKER, SKOW-BANKER: obs.
Preinceton Union (MN) 31 Aug. 6/2: ‘This yere ain’t no old tea wagin, no fishin’ boat, you old “scowbanker”. It’s a wessel-o’-war’.
H. de V. Stacpoole Blue Lagoon (2004) 54: ‘Here, you scowbanker! [...] who are you to be giving directions—’ ‘Scowbanker yourself!’ replied the fellow.
[Aus] (ref. to late 19C) Baker Aus. Lang. 102: The scowbanker or skullbanker (1886), coaster (1878), sundodger [...] were other vagabonds who loafed in the outback or drifted from station to station.

In derivatives

scowbanking (n.)

(orig. Aus.) the state of loafing or idling.

[Aus]Bell’s Life in Sydney 4 Mar. 1/6: Everything neat, clean and comfortable-no indicia of the public-house here-no disgusting scenes- no swearing-no scow-banking.
[UK]Liverpool Mercury 12 Apr. 7/6: It is due to the great labours [...] which have been made on our part [A Voice: ‘Without any scowbanking’).