“Hank Marvin” is Cockney rhyming slang for “starving.”

“I’m Hank Marvin” means “I’m hungry” or “I’m ravenous.”

Hank Marvin is a British musician from the 1960s and 1970s, and is a pretty obscure reference nowadays. Marvin played guitar in Cliff Richard’s backing band in the 1960s.

“When are we going to eat? I’m Hank Marvin.”