The Collaborative International Dictionary of English v.0.48:

Rum \Rum\, a. [Formerly rome, a slang word for good; possibly of
   Gypsy origin; cf. Gypsy rom a husband, a gypsy.]
   Old-fashioned; queer; odd; as, a rum idea; a rum fellow.
   [Slang] --Dickens.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rum \Rum\, n.
   A queer or odd person or thing; a country parson. [Slang,
   Obs.] --Swift.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rum \Rum\, n. [probably shortened from Prov. E. rumbullion a
   great tumult, formerly applied in the island of Barbadoes to
   an intoxicating liquor.]
   A kind of intoxicating liquor distilled from cane juice, or
   from the scummings of the boiled juice, or from treacle or
   molasses, or from the lees of former distillations. Also,
   sometimes used colloquially as a generic or a collective name
   for intoxicating liquor.
   [1913 Webster]

   Rum bud, a grog blossom. [Colloq.]

   Rum shrub, a drink composed of rum, water, sugar, and lime
      juice or lemon juice, with some flavoring extract.
      [1913 Webster]

WordNet (r) 3.0 (2006):

rum
    adj 1: beyond or deviating from the usual or expected; "a
           curious hybrid accent"; "her speech has a funny twang";
           "they have some funny ideas about war"; "had an odd
           name"; "the peculiar aromatic odor of cloves"; "something
           definitely queer about this town"; "what a rum fellow";
           "singular behavior" [syn: curious, funny, odd,
           peculiar, queer, rum, rummy, singular]
    n 1: liquor distilled from fermented molasses
    2: a card game based on collecting sets and sequences; the
       winner is the first to meld all their cards [syn: rummy,
       rum]

The Devil's Dictionary (1881-1906):

RUM, n.  Generically, fiery liquors that produce madness in total
abstainers.