MMB definition by Slang.net
This page explains what the acronym "MMB" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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MMB is an acronym for message me back. It is similar to WMB and is used primarily in online chat and text messaging.
MMB is most likely used by a sender that wants a reply sooner rather than later. It may be in reference to needing buying tickets for an event, getting food orders, or a question about a love interest.