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Short for "Platonic Baes". When you care about someone like you would care for a bae, but in a platonic sense.
Jane's friend: "Are you dating John?"
Jane: "No! We've been friends since we were four, we're only plaes. I care about him but he's just a friend."
Jane: "No! We've been friends since we were four, we're only plaes. I care about him but he's just a friend."
by Ainsworth Ennis January 12, 2015