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A unit of measurement, often used as a bartering tool among schoolchildren. It is less than half of a cigarette, but more than 'threes' (one third) which one person will share with another.
Jack: "Save me half on that cigarette please?"
Joe: "No, I want more than half, I'll save you threes"
Jack: "I don't want threes, that's not enough"
Joe: "Fine, I'll save you thralf then"
Jack: "Okay"
by Shhhhhhh17 April 12, 2009
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