WordNet (r) 3.0 (2006):

slammer
    n 1: a person who closes things violently; "she's a dramatic
         slammer of doors"
    2: 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) [syn:
       jail, jailhouse, gaol, clink, slammer, poky,
       pokey]