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."