Definition of Slammer

Noun: slammer sla-mu(r)

A person who closes things violently
"she's a dramatic slammer of doors"
A correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence)
- jail, jailhouse, gaol [Brit], clink, poky, pokey, prison, calaboose [Austral]