Okay, so swatting is when someone makes a prank call to the police, pretending that there is a dangerous or serious situation going on at someone's house.
This means that the police may come rushing to the house, thinking that there is an emergency that they need to take care of.
But there is no actual emergency, it's just a mean joke.
Swatting can be very dangerous because the police might use force to enter the house, not knowing that there is no real threat.
It's a very bad thing to do and can put innocent people in danger.