Looking for online definition of LTB or what LTB stands for? LTB is listed in the World's largest and most authoritative dictionary database of abbreviations and. Laryngotracheobronchitis (LTB) is an inflammation and obstruction of the larynx, trachea, and major bronchi of children. What does LTB stand for? What does LTB mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: LTB. LTB means Looking to Buy. The meaning of LTB is: looking to buy.