Mum
mum definition by Slang.net
This page explains what the slang term "mum" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Mum is an endearing way to refer to a mother. It is primarily used in British English but may also be used in American English as an alternative to "Mom."
Some see "Mum" as a lazier version of "Mom" because the "u" is easier to say than the hard "o." This is why it is considered a slang term by some people. Mum may also be used as an alternative to "silent," like in the "Mum's the word" phrase.