loony bin

from WordNet (r) 3.0 (2006)

loony bin
    n 1: pejorative terms for an insane asylum [syn: {Bedlam},
         {booby hatch}, {crazy house}, {cuckoo's nest}, {funny
         farm}, {funny house}, {loony bin}, {madhouse}, {nut house},
         {nuthouse}, {sanatorium}, {snake pit}]

from The Collaborative International Dictionary of English v.0.48

loony bin \loony bin\ (l[=oo]n"[y^] b[i^]n) n.
   An institution for the confinement or treatment of insane
   persons, such as an insane asylum or the psychiatric ward of
   a hospital. [slang]

   Syn: mental institution.
        [PJC]

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