I grew up with it, so...probably poor people? Though like a bunch of other things, wouldn't surprise me if it started with poor black folks and other poor folks adopted it. Seems to be the way a lot of things go, esp in the south(raised in VA and NC here).
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Kroger brand chunky peanut butter and whatever grape jelly is on sale was a childhood staple
(I’m white people and did not grow up poor.)
Really livens up an egg mcmuffin, too