It will get executed, unless your order is way over the average order size. Of course, for a trading premise, the above advice is completely meaningless. Make sure you know the difference. But when you buy a hot stock on a trading premise, and then don't watch the pot, it is more likely that the pot will boil over on you. Surprisingly, this happens all the time.
Investors buy a stock, on a tip, on a message board notice, on a news article, or on a TV spot.
In fact, the TV spot or news article may be about the stock's sharp run. So the eager investor buys in. And then goes about trying to learn more about the stock. For an investment, this is exactly the wrong way to buy a stock. For a trade, jumping in on a hot stock, on a momentum premise, is perfectly legitimate.