No, that's not a little known battle cry from the Spanish-American War. I'm talking about the Yumbo – a sandwich that was once offered at Burger King. According to the ad above, which appeared in the Lorain Journal on May 21, 1970, it comprised "a generous portion of thinly sliced smoked ham with American cheese on a special egg roll, served piping hot."
I guess that makes it a hot ham and cheese sandwich – which usually sounds pretty good to me. Here's an illustration of one, courtesy of Retroist.com, which has a nice writeup about the Yumbo.
The article notes that the bun was eventually changed to a more conventional sesame seed one.
(Unfortunately, the name "Yumbo" makes me think of "Dumbo" and/or "Jumbo," two famous elephants. And while elephant ears are a tasty treat, elephants in general don't exactly have a positive effect on my appetite, thanks to their dry, leathery skin.)
The Yumbo remained on the Burger King menu until 1974.
But then a funny thing happened. It seems to be one of those sandwiches – like McDonald's McRib – that just keeps coming back. It returned to the menu at participating restaurants in 1988. Here's a commercial that ran on a Toledo TV station.
More impressively, the Yumbo made a full-fledged comeback in December, 2014 – 40 years later after it was retired in 1974 – thanks to popular demand. Of course, the price went up – to $3.69. And it looked a lot different.
I don't think the Yumbo is still on the Burger King menu, but I wouldn't be surprised if it made another yummy comeback.