Grandma grew up in the Great Depression. There was no waste. If food was burnt, you scraped off the burnt bit and ate the rest.

"Grandma burnt" means that the food (usually toast) is burnt, but not burnt so badly that you can't scrape off the burnt part and eat the rest. It's not "really" burnt.
That toast is only grandma burnt. You can still eat it.
by November 7, 2020
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