noun
slammer
SLAM-er/ˈslæmər/
A jail or prison.
A locked, barred door blocks the way out of the slammer.

Etymology
A slammer is literally something that slams. The prison sense perhaps grew from an earlier slang use meaning “door,” linking confinement with a door shutting forcefully.
In context
It'll be another Christmas in the slammer for John Gotti. The reputed Gambino Crime Family boss was arrested last December.
More examples
- He spends six months in the slammer for theft.
- The judge threatens to send her back to the slammer.
- He wants a steady job and a life outside the slammer.
Forms
slammer · slammers