im-
From Longman Dictionary of Contemporary Englishim-im- /ɪm, ɪ/ prefix NOTthe form used for in- before b, m, or p immobilize impossibleExamples from the Corpusim-• to implodeIMIM /ˌaɪ ˈem/ noun [uncountable] (instant messaging) a type of service available on the Internet that allows you to quickly exchange written messages with people that you knowFrom Longman Business DictionaryIMIM abbreviation for instant messaging