A “shill” is a snake oil salesman who tries to trick you into buying their shitcoin by relentlessly promoting their “potentially huge payouts”.
There is, of course, no chance of that happening and all you do if you buy the token they are cheating you with is make them rich, and now you end up with the bag.
This leads to an endless spiral when you end up being the accomplice as you try to unload your shitcoin on someone else after the original perpetrator is long gone into the night.
When all you’re doing is focusing on bitcoin, not “crypto,” you’ll spot an accomplice a mile away and not fall for their scams.