The term 'Vegas Staple' refers to the SLOT machines that are found in casinos in Las Vegas. SLOT machines are a popular form of gambling, and they have been a mainstay of the Las Vegas gambling scene since their introduction in the early 20th century. SLOT machines are also known as one-armed bandits, due to the lever on the side of the machine that is used to activate the game. SLOT machines are a major source of revenue for casinos, and they remain a popular form of entertainment for visitors to Las Vegas.