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"little child," 1725, Scottish, of uncertain origin, perhaps a shortened form of totter, or related to Old Norse tottr, nickname of a dwarf (cf. Swedish tutte "little child," Danish tommel-tot "little child," in which the first element means "thumb").
"to reckon up," 1760, from tot (n.), first recorded 1680s, short for total.
Completely; unquestionably: totally his fault/ totally awesome