Green’s Dictionary of Slang

(US) money.

1929		V.W. Saul ‘Vocab. of Bums’ in AS IV:5 343: Oday——Money.
1933		N. Algren ‘So Help Me’ in Texas Stories (1995) 25: The Jew will grab the oday he says like it is all settled.
1949		Monteleone Criminal Sl. (rev. edn).
1950		Goldin et al. DAUL 148/1: Oday. Money.