Noun has 2 senses

• slammer(n = noun.person) - a person who closes things violently; "she's a dramatic slammer of doors"

Derived form verb slam₁

• slammer(n = noun.artifact) clink, gaol, jail, jailhouse, pokey, poky - 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);