Blow-Off Top

in technical analysis, a chart pattern showing a sharp rise and a sharp fall in both price and volume within a short (four days to six weeks) time period. Also called a parabolic blow off, the pattern signifies panic buying followed by a sell-off, called a blow off move or an exhaustion move.

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A steep and rapid increase in price followed by a steep and rapid drop in price.
Here is an example of a blow-off top, a steep rise followed by a steep fall.

Investopedia Says:
The rapid increase can be a result of either actual news or simply a wild rumor.

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