Kagoole Share definition Flag Rain mac, Over coat, Waterproof. Any outdoor coat which is waterproof. Usually used for walking or the outdoors. Shortened to 'kag'. Hence; 'kag in a bag'. Have you got your kagoole incase it rains. Have you got your kag incase it rains. Kagoole by joan2000 January 27, 2009 0 0 Get merch Get the Kagoole mug. Buy Now — $32.95 See more merch