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PB and Jam are fraternal twins and also best friends. Many people, upon entering their teen years, start distancing themselves away from their parents and siblings. It's just part of growing up. These two though? Nah. Never. They're still as close as they were when they still shared a one-bedroom apartment in Mama Ponka's stomach. Jam (much like Cupcake, and also Pinkie), loves PB, and will destroy anybody that so much as makes her baby brother sniffle (yes, baby brother, she's a whole two minutes older than him, so there!) For this reason, she keeps him out of her shadier business dealings, pretending to be a traveling vacuum cleaner salesmare, or something like that. PB is the more dependent of the pair and much prefers to let his sister take charge of situations. When they were younger, PB suffered from persistent shyness and selective mutism, so Jam grew to do most of the talking for him. This isn't always a good thing, PB really wishes him family wouldn't coddle him so much

Since PB's middle name is James (Jam's is Jessie, naturally), she calls him "Jim". 

idk what they're talking about, why don't y'all have a guess