Green’s Dictionary of Slang

schlog v.

[Ger. schlagen/Yid. shlogn, to punch]

(Aus.) to punch or hit; to deliver a hefty blow .

[Aus]Eve. Jrnl (Adelaide) 31 Aug. 3/7: Mine bipe, I sohmoke him lebenslang; / I hopes to nefer shtop: / Und if man dells me ‘Gife it oop,’ / I schlog him on de kop.
[Aus]Eve. Jrnl (Adelaide) 1 may 5/1: I think he will find her a very difficult woman to deal with, and perhaps she may go so far as to ‘schlog him on der kop’ .
[Aus]Dly Mail (Brisbane) 27 Aug. 4/4: Statesmen who wage war by referendum and ‘schlog’ their enemies by plebiscite, who bellow ‘Bolshevik!’ at their political adverseries, and then subside into placid content, may interest the student of national humor.

In phrases

schlog it on (v.)

1. (Aus.) to inflate the price of an item for sale.

Dly Northern Agrus (Rockhampton, Qld) 1 May 2/5: According to the appearance of the customer so would range the price. With an amateur sportsman in the shop the signal used to be ‘Schlog it on,’ i.e., stick on the price to him; and ‘Smooga,’ take him down; if the customer showed any knowledge of guns the warning was ‘Calph’ or beware, ‘Sthune’ or lookout, you are dealing with a smart man.
Freeman’s Jrnl (Sydney) 27 July 19/2: After this the station did not pay on account of the rabbit pest and other causes for (say) three or four years, during which the company commence to ‘schlog’ it on again.
[Aus]Sun. Times (Perth) 1 Apr. 1/2: You should have learned, my pippin, years agone, / State money makes the seller ‘schlog it on’ .

2. in fig. use, to exaggerate, e.g. in speech.

[Aus]Bendigo Indep. (Vic.) 30 Apr. 2/4: Some of the jurors wanted to ‘schlog it on’ after the style that the Abrahams used to ‘schlog it on’ to their duped customers.
Mt Alexander Mail (Vic.) 8 Apr. 3/3: Are you not ‘shlogging’ it now in the witness box?’ I am not. What would the customers think when Louis would say to his brother, ‘Schlog it on?’ I enjoyed it very much.