bumfyoudaoicibaDictYouDict[bumf 词源字典]
bumf: [20] The earliest, literal, but now long discontinued sense of bumf is ‘toilet paper’ (first recorded in 1889), which does much to elucidate its origin: it is short for bum fodder. The element of contempt is carried over into its modern meaning, ‘unwanted or uninteresting printed material’, which dates from around 1930.
[bumf etymology, bumf origin, 英语词源]
bumf (n.)youdaoicibaDictYouDict
"papers, paperwork," 1889, British schoolboy slang, originally "toilet-paper," from bum-fodder.