This is from a scene from the movie The Matrix. The hero is offered to take either a blue pill or a red pill. If he takes a blue pill, he will continue living in Normal happy dream life in ignorance. If it takes a red pill, he will learn the brutal truth of his existence. Neo takes the red pill, and he wakes up in a bathtub in some alien Factory with lots of tubes connected to him. He is surrounded by thousands of sleeping humans in the same condition. He learns that everything before was only in Alien induced dream, and that he and the humans were being fed upon.
Thus the term red pill.
Still on the Make It Rain tangent... We can make it rain by stirring up all those who don’t believe in Q but DO believe in our Republic. If we stir up the FReepers on other threads to take action on topics like voter fraud, corruption, payola, human trafficking, etc. we are essentially red pilling them without calling attention to it.
In this way, we can encourage them to become activists and all their efforts will add to the Storm.