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OBCD is just a fancy way to say you look like a donut with a side of fries. People use it so they don't have to say the word Obesity and sound like they're insulting you.
Hey, you're looking extra doughy today. Must be OBCD season!
I'm not fat, I'm just in OBCD mode.
That's not a snack, that's a full meal. You've got OBCD.