Green’s Dictionary of Slang

dooteroomus n.

also doot
[? SE duty + Deuteronomy, the book of the Pentateuch that dictates the rules of society]

(US) money.

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[US]Schele De Vere Americanisms 296: Among the less generally known terms [for money] are [...] spondulics, dooteroomus, often shortened into doot [etc.].