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One of the heads of Jason Russell's Invisible Children organization made a video after the charity won a $1 million grant ... in which he appears to be drunk and joking about keeping $900,000 for himself.

TMZ has obtained the clip ... featuring Jedidiah Jenkins, the Director of Ideology for the charity dedicated to hunting down African warlord Joseph Kony.

The footage appears to be shot in 2010 ... right after Invisible Children won the $1 million grand prize in the Chase Community Giving Facebook competition.

In the video, Jenkins is holding a handle of Smirnoff vodka ... and slurs to the camera, "I don't know if you heard this or not ... but we won a ... we won a million dollars so ... pretty rad."

After chugging from the bottle, Jenkins continues ... "a hundred thousand for Haiti and $900,000 in extra for me."

As for the Haiti reference ... the contest was held one week after the earthquake in Haiti and Invisible Children had promised to give $100k to Haitian relief efforts if they won the prize. We have no idea how the remaining $900,000 was spent.

A source connected to Invisible Children says the video is a joke that Jedidiah recorded and posted on a private YouTube page right after the group won the prize. We're told the bottle was filled with water, not vodka.

Invisible Children's rep has not responded to our calls for an official comment.

10:00 AM PDT -- Jenkins has finally commented on the video ... saying, "I was joking. It was made for my co-worker who was out of town when we won the prize."