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Written or typed notation for "mother fuckin," as there are 10 characters between M and N. This alternate spelling is used to sanitize or shorten length-constrained status messages on social networking services.
See also: i18n = internationalization; L10n = localization
From a tweet: "Some m10n jerk just dinged my car and drove off without leaving a note!"
by RyanHos October 25, 2010