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The official measure of the length of the circle formed by a round firm twerking booty. The outer twerkumference is the measure of the twerking booty in the relaxed state, while the inner twerkumference is its measure in the tensed state.
"Latisha exhibits an awe inspiring twerkumference."

"Last night I measured Deshonda's inner twerkumference."
by uncle old head mike June 04, 2013