n. — slang, rare
toilet paper.
Type: 2. Preservation — The Historical Dictionary of American Slang has a citation for bumwad from 1896 with the meaning toilet paper. However, American sources more commonly use the term to mean newspapers and other publications supposedly fit only for such use. The word is first found in Canada in the 1970s with the sense ‘toilet paper’ (see the 1976 quotation). The meaning in Canada seems to be a preservation of an older meaning used in the US and probably the UK as well. Chart 1 shows a considerable frequency in the UK with Canada in second place, but no longer many US hits.
See also COD-2, s.v. "bumwad", which is marked "Cdn slang", and DARE, s.v. "bumwad", HDAS, s.v. "bumwad".
Images:

Chart 1: Internet Domain Search, 4 Feb. 2016