Also Inflected form of mug mugging mug·ging UK/ˈmʌɡɪŋ/ US/ˈmʌɡɪŋ/ uncommon noun 1. assault with intent to rob Related words Word family mug Broader terms assault WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.