When, in school, you find some tissue paper then wet it then throw it at the ceiling. Then it later falls down on someones head.
"Aww man, i just got Jackajoo'd"

"LOL, i just Jackajoo'd that guy."

"That guys about to have a Jackajoo on his head."

"Hey man, is that like some bird shit?"
"No, it's a Jackajoo."
by Michael James Taylor July 19, 2009

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