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A word used to express an emotion such as, happyiness, excitement, or hornyness.

Also used to fill in silent, or awkward moments.
Mom: "We're getting pizza tonight!"

Son: "Yaka Mumu!"

Example 2:

Girl: "How do you feel about this shirt on me?"

Silent/Awkward moment..

Guy: "Yaka Mumu!" **runs away*
by Mr. Big Gunz September 14, 2008
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