"Pumping" means giving information (true, or false) to pump a stock.
The pump (meme the stock up), then dump (aka: Roaring Kitty becomes a millionaire). That's it. Its really straight forward. The question is how many people can you trick or rope into the scheme, that's all.
"Boiler Rooms" in the 90s did the same thing, just with far less efficiency than WSB. That's all I'm saying. WSB is the "best" at the job. Yeah, spreading rumors (some true, some not), but all for the purposes of making the rumor-spreader more money. Just because YOU call it a "meme" doesn't change the fundamental rumor-spreading behavior here.