A gambling term that means you are up and winning a lot of money. Pumping feels even better when you were previously dumping.
Jackson was dumping for the first hour in his poker session, but then he started pumping once everyone thought he was a moron and they started calling him. He pumped everyone's chips away except for that sweet old ladies!
when you grab the meaty part of someones upper arm like by their bicep and pump it by clenching and unclenching your hand around their arm. This should be used when someone is excited, nervous, turned on, or scared