What's the difference between i.e. and e.g.?
colloquial "good-bye" word, 1907, of unknown origin; variant tooraloo is recorded from c.1921.
A parting salutation •Thought of as a humorous affectation, like ''cheerio''
[1907+; perhaps an alteration of French a` tout a` l'heure, ''see you soon, so long'']