This is slang for a fart-- especially a fart that is somewhat spooky.
"Is that a brown casper floating around? What a spooky and smelly situation!" or
"I wish I did not unleash that rancid brown casper when I was at that dinner party."
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A depressed child at the verge of dying but can't because it'll upset everyone, and when tried, got yelled at. A Casper is someone who can't control their emotions, or feelings. Keeping everyone away from who they actually are in fear of being left behind.