Short squeeze

A situation in which a lack of supply and an excess demand for a traded stock forces the price upward.

Investopedia Says:
Short squeezes occur more often in smaller cap stocks with small floats.

If a stock starts to rise rapidly, the trend may continue to escalate because the short sellers will likely want out. For example, say a stock rises 15% in one day, those with short positions may be forced to liquidate and cover their position by purchasing the stock. If enough short sellers buy back the stock, the price is pushed even higher.

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Situation when prices of a stock or commodity futures contract start to move up sharply and many traders with short positions are forced to buy stocks or commodities in order to Cover their positions and prevent losses. This sudden surge of buying leads to even higher prices, further aggravating the losses of short sellers who have not covered their positions. See also Selling Short.

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