@misterslang.bsky.social may have some doubt about the surfing origin, signaled by the question mark?
greensdictofslang.com/entry/igeq5ta
greensdictofslang.com
tubular, adj. — Green’s Dictionary of Slang
Extinguished Perfesser of Anguish at Ruckers–Nork; mooseophile; wine guzzler; author of many books, a few of them readable; harmless eccentric. C18 BritLit, dictionaries, book history, fakery, life-writing, political smartassery. jacklynch.net