It is thought the phrases were popularised by travelling salesmen, who either invented them as a game or else as a way to confuse locals.

Source: https://www.dailymail.co.uk/news/article-11806699/Cockney-accent-moved-London-Essex-research-shows.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

Johnson said that while Chabad traditionally acts as “salesmen for spirituality,” he’s witnessed more students approaching him to take on mitzvot, like hanging up mezuzot, wrapping tefillin and joining Shabbat dinner, than ever before.

Source: https://tjpnews.com/ut-students-face-antisemitism-advocate-for-israel/?utm_source=rss&utm_medium=rss&utm_campaign=ut-students-face-antisemitism-advocate-for-israel

Set in a retro-future world, the sci-fi dramedy follows his character, Jack, and other salesmen who are tasked with selling lunar timeshares to gullible and desperate customers.

Source: https://www.digitaltrends.com/movies/tv-shows-february-2023-need-to-watch/

Traveling salesmen are akin to gamblers, Crudup argued, always playing the odds, always counting on the big win.

Source: https://www.nytimes.com/2023/02/10/arts/television/billy-crudup-hello-tomorrow.html

What the people want is to stop the boats and to tell overpaid crisp salesmen to put a sock in it.

Source: https://www.express.co.uk/news/politics/1844127/gary-lineker-rwanda-together-with-refugees-letter