Wiktionary
folding stuff
n. (context slang English) paper money.
Usage examples of "folding stuff".
Which, in turn, led him to the conclusion that if he made enough of the folding stuff he might be able to grease the right wheels and roll right on out of the firing line.
Others, and this must certainly include the likes of John Omally within their avaricious ranks, could only smell the green and folding stuff.
But out it came, the lunch, the champagne, the money, all the green and folding stuff.
There's a chronic shortage of the folding stuff in all forms of teaching.