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1.
The sound a walrus makes.
I am the walrus; ku ku kachoo.
by Emily / Heartwood January 24, 2010
 
2.
an alternate spelling of coocoocachoo. An expression of exitement, happiness, agreement, or other generally positive emotions.

Bill: "My parents are gone for the weekend."
Ted: "Kukukachoo dude!"

OR

Betty: "That guy's hot."
Jenny: "Kukukachoo!"
by Chumus May 12, 2007