This is 'one of the most dangerous stocks' on Wall Street, according to money manager

, he says, is a no-touch here — either to back or bet against. At its peak on Tuesday, shares were up 48% for the week. It now looks to close out the week up 16%.

"It's one of the most dangerous stocks in the world. I don't want to own it; I don't want to short it. It's very speculative. Large-cap companies aren't supposed to trade like penny stocks — go up 20% one day, down 20% the next," said Tepper on CNBC's "This week's surge was partially due to a short squeeze — a large number of short investors who were forced to cover their open positions against the name by buying the stock when it began to take off.

"I sent out a note earlier this week when the stock was above $900 saying the thing had gotten ridiculously overbought and should pull back significantly, and I'm not ... a perma-bear on the stock by any means," Maley said during the same segment. "When we see these individual investors come in and buy the stock like that, that is usually a sign that a top is it."

Tesla's RSI, or relative strength index, traded as high as 94 earlier this week. Any reading above 70 typically signifies overbought conditions. "It is extremely overvalued right now. From my perspective, the most optimistic expectations are built in, so now there is execution risk," added Tepper."To be honest, I have no idea where this stock is going to trade tomorrow, because it has a mind of its own," said Tepper. But "the stock works when Tesla is in that planning and storytelling stage, but it doesn't work in the execution stage.

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