2
Early sources cited in the RHHDAS
J.E. Lighter, Random House Historical Dictionary of American Slang (1994) has a succinct entry for geetus:
geetus, n. {orig. unkn.} money. Also var[iant]s. [Earliest three citations:] 1926 Finerty Crimanalese 25: Geetus—Bankroll. 1935 Pollock Und. Speaks: Gh...