Top Definition
A friendly and light-hearted way of asking 'What's on your mind?'

usually used in a conversation between close friends, not really the kind of thing you'd say to you're boss or a man of the cloth.
Dobby: What's a-bobbin in your noggin?
Harry: Voldemort :)
by NomNomPotashMcBobbinson May 13, 2011

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