The story
* sense 1: Blend of text + expert; text in this context meaning "literature". The coinage is most commonly attributed to John Lennon, the primary lyricist of the Beatles song "I Am The Walrus", released in 1967; Lennon used the term in reference to those who attempted to find meaning in the lyrics he wrote. * sense 2: Blend of text + expert; text in the context of digital text messages.
Etymology from Wiktionary, CC BY-SA 4.0.