The Collaborative International Dictionary of English v.0.48:

Toboggan \To*bog"gan\, n. [Corruption of American Indian
   odabagan a sled.]
   A kind of sledge made of pliable board, turned up at one or
   both ends, used for coasting down hills or prepared inclined
   planes; also, a sleigh or sledge, to be drawn by dogs, or by
   hand, over soft and deep snow. [Written also tobogan, and
   tarbogan.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Toboggan \To*bog"gan\, v. i. [imp. & p. p. Tobogganed; p. pr.
   & vb. n. Tobogganing.]
   To slide down hill over the snow or ice on a toboggan.
   --Barilett.
   [1913 Webster] Tobogganer

WordNet (r) 3.0 (2006):

toboggan
    n 1: a long narrow sled without runners; boards curve upward in
         front
    v 1: move along on a luge or toboggan [syn: toboggan, luge]