Contraction for Yes maam, typically used in the south.
Woman: Little boy, will you shut the window.

Boy: Yes-um
by E.M June 19, 2006
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The word "yes" with an added Sourthern twang.
Yes-um dis sho am good.
by Jasper Mint-Julep June 15, 2006
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When yummy is ready
Mom; Heskeboy your dinner is ready!
Heskeboy: um yes please um no please
by lilyungcylinder September 24, 2018
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