The Cybertruck has special outlets in the back, but you can't use them when you're charging the car with a regular plug.
This is because the car uses the same part to turn regular electricity into the kind it needs to charge, and to power the outlets.
It's like having one switch for two lights, and the switch can only handle one light at a time.
But Tesla is working on making it so you can use the outlets and charge the car at the same time!