What does get the memo mean?
You say someone “didn’t get the memo” to express that they were unaware or uninformed about something that others knew about. It is usually meant humorously or sarcastically (e.g., “Yes, striped T-shirts are in this summer; didn’t you get the memo?”).
The literal meaning of “memo” is a concise internal message that communicates information about an aspect of an organization’s official business.
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