I think they may be referring to the "pop" some tech companies have gotten lately where they may have been purposely undervalued so when they IPO they get a nice 5-10% "boost" and good publicity when they open.
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.