(someone) could sell sawdust to a lumber mill
Someone is an extremely smooth, charming, or persuasive salesperson, such that they could sell something to those who have no need or use for it. I can't believe you were able to sell an extra 200 units to the hospital. You could sell sawdust to a lumber mill! Tom's the kind of guy who could sell sawdust to a lumber mill, so don't get sucked into any of his sales pitches. We simply don't have the budget for any non-essential purchases right now. We have to hire this woman for our sales department—she could sell sawdust to a lumber mill!
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