“I can't. It's jammed.”
You and a coworker are trying to print a calendar at work. It got stuck in the printer. Your coworker tells you to pull the paper out, but you can't.
I can't. It's jammed.
"Jammed" means "stuck". Specifically, it means to be stuck between things.
We use the word "jammed" to talk about things like:
- getting your finger jammed in a closing door
- a piece of paper being jammed in a machine
- cars being jammed in traffic
In all of these situations, the word "stuck" would also work.