Teetotalism is the practice or promotion of complete personal abstinence from alcoholic beverages. A person who practices (and possibly advocates) teetotalism is called a teetotaler (plural teetotalers) or is simply said to be teetotal. The teetotalism movement was first started in Preston, England, in the early 19th century. The Preston Temperance Society was founded in 1833 by Joseph Livesey, who was to become a leader of the temperance movement and the author of The Pledge: "We agree to abstain from all liquors of an intoxicating quality whether ale, porter, wine or ardent spirits, except as medicine."
There is some dispute over the origin of the word teetotaler. One anecdote attributes the origin of the word to a meeting of the Preston Temperance Society in 1833. The story attributes the word to Richard Turner, a member of the society, who in a speech said "I'll be reet down out-and-out t-t-total for ever and ever".
A variation on the above account is found on the pages of The Charleston Observer:
Teetotalers.--The origin of this convenient word, (as convenient almost, although not so general in its application as loafer,) is, we imagine, known but to few who use it. It originated, as we learn from the Landmark, with a man named Turner, a member of the Preston Temperance Society, who, having an impediment of speech, in addressing a meeting remarked, that partial abstinence from intoxicating liquors would not do; they must insist upon tee-tee-(stammering) tee total abstinence. Hence total abstainers have been called teetotalers.
An alternative explanation is that teetotal is simply a reduplication of the first "T" in total (T-total). It is said that as early as 1827 in some Temperance Societies signing a "T" after one's name signified one's pledge for total abstinence. In England in the 1830s, when the word first entered the lexicon, it was also used in other contexts as an emphasized form of total; a comparable American English locution would be "total with a capital T" (an instance of the "[word] with a capital [word-initial letter]" snowclone).