IPO "pop" is a bit of pejorative usually referring to the deliberate underpricing of an IPO so that the investment bankers' big clients can get a quick profit,

IPO "pop" is a bit of pejorative usually referring to the deliberate underpricing of an IPO so that the investment bankers' big clients can get a quick profit, the difference between the IPO price and the first available exchange price. In the context of this thread, an example of Wall Street sleaze.