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It is a non-specific time and date just over or inside of a calendar month. It is a way of remarking that "in about/around/close to...a month"

It is used often to comment on the fact that an event is nearing about a month from occurring so one would say "month-ish"

to say soon would be too vague so one says monthish the way a person picks a time such as: around 3ish
Yay!!! I get to see you in a monthish:)!!!
by Randoni March 10, 2011
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