What is a monkey in money?

From Jungle to Wallet: The Curious Tale Behind “Monkey” as Slang for Money

Ever heard someone say they need to spend a “monkey” and wondered what primates have to do with cash? It turns out, the phrase might have roots stretching back to British colonial India—and no, it doesn’t involve actual monkeys handing out banknotes.

During the 19th and early 20th centuries, old Indian rupee notes featured various animals. The 500-rupee note reportedly had a monkey on it, while the 25-rupee note showed a pony. British soldiers serving in India at the time are said to have picked up on these designs, bringing the nicknames back home. Over time, “monkey” became slang for £500, and “pony” for £25—despite the obvious mismatch in currency values.

It’s a quirky bit of linguistic evolution, where cultural encounters and visual cues sparked lasting slang. While these terms aren’t commonly used today, especially “monkey” for £500 (which would be wildly outdated given inflation), they remain a charming footnote in British monetary jargon.

And it doesn’t stop there. The phrase “bag of sand” emerged more recently as rhyming slang for “grand”—that is, £1,000. These expressions reflect how language bends and twists through history, often rooted in humour, memory, and a dash of imagination.

So next time you hear “monkey” tossed around in a British film or period novel, you’ll know it’s not about the animal—it’s about a legacy of colonial currency and soldiers with a sense of humour. In the world of slang, money really does talk, and sometimes, it swings from the trees.