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A cross between undulating (shaking uncontrollably) and yuyulating ("wawawawawawa") loudly.

Often used to express excitement.
John didn't know how to yulundulate, but Janice Jackson taught him-- Soon when he yulundulated anytime he was excited.
by Reed Wommack August 25, 2007
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The vengeful act of crapping on a lover's chest while they sleep.

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