pupshit means a minuscule thing, not important and is used by the writer James Patterson, so I think it's a San Francisco thing.
"Pupshit," the biker grunted, leveling his cold, hard eyes in his face. "That's all you assholes got on me."
from James Patterson's "2nd Chance"
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Poking someone in the belly button.
"Ouch, you button-holed me. That shit hurts!"
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