The story
Derived from preach by analogy with teach : taught. Apparently a modern jocular construction but taken seriously by some. In print, generally appearing as a nonce in a much-quoted doggerel verse, attributed by some to Phoebe Cary in 1854, appearing in Punchinello 1.27 in 1870, there attributed to Amos Keeter. See quot. 1870.
Etymology from Wiktionary, CC BY-SA 4.0.