An extremely scary drunk person, often completely out of control and cannot speak or make their own decisions correctly. (The more Bouka's you add to a persons name, the scarier they are)
She was sooo bouka bouka scary scary last night when she got lost on the subway.
You're being so bouka bouka bouka right now i can't even understand you!
I'm not surprised I did that, I was wicked bouka bouka.