1907, John Brynildsen, Engelsk-Dansk-Norsk Ordbog A dictionary of the English and Dano-Norwegian languages, part II (N–Z), entry for oof, page 49 (archive.org ebook):… oofy'u·fisl som har megen Mønt …
1909, Storer Clouston, The Prodigal Father, page 185 (Gutenberg ebook):Money isn't everything in this world. Youth and love and pluck are the main things. Hang it, what if you do get into debt occasionally? You've got a pretty oofy father-in-law.
1934, P. G. Wodehouse, (Gutenberg ebook):This Tom has a peculiarity I've noticed in other very oofy men. Nick him for the paltriest sum, and he lets out a squawk you can hear at Land's End. He has the stuff in gobs, but he hates giving up.