Monkey

Monkey is a slang term in betting that refers to £500 (or an equivalent amount in other currencies). It is commonly used among UK gamblers, especially in high-stakes betting circles.

For example, if a bettor says, "I put a monkey on that horse", it means they wagered £500 on the selection. Similar slang terms include "Ton" (£100), "Grand" (£1,000), and "Pony" (£25). These terms are mostly used in informal betting conversations, particularly in horse racing and sports betting.