The Collaborative International Dictionary of English v.0.48:

Tot \Tot\, v. t. [imp. & p. p. Totted; p. pr. & vb. n.
   Totting.]
   1. To mark with the word "tot"; as, a totted debt. See Tot,
      n.
      [Webster 1913 Suppl.]

   2. [Cf. Total.] To add; to count; to make up the sum of; to
      total; -- often with up. [Colloq., Eng.]

            The last two tot up the bill.         --Thackeray.
      [Webster 1913 Suppl.]