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1.
Used to add enthusiasm to an insult placed inside the parentheses.
How to use "Mmm. " ", yeah?":

Example 1
Anne: "DTF?"
Jessica: "Mmm. Go fuck yourself, yeah?"

Example 2
Jay: "How big is your dick?"
Nichole: "Mmm. Go ask your mom, yeah?"
by SiccaSays June 29, 2011