POP

A POP is a sudden spike in the price of a stock to a certain level. You will see Floor traders mention "I will short $XYZ on pop to $100". This means they are looking to short sell $XYZ if the price gets to $100. Let us look at one more example: "Long $XYZ at $100 looking to sell if it pops a point from here". In this scenario they bought the stock $XYZ and will be exiting the trade if the stock spikes to $101.