Subbing meaning : To substitute for. To work as a substitute teacher, especially in primary and secondary education. To replace (a player) with a substitute. Less commonly, and often as sub on, to bring on (a player) as a substitute. To perform the work of a subeditor or copy editor; to subedit. To lend. To subscribe. (BDSM) To take a submissive role. To coat with a layer of adhering material; to planarize by means of such a coating. To prepare (a slide) with a layer of transparent substance to support and/or fix the sample. A copy editing process.