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A big dumb reaction to something that scares you. Use it in church if you don't want to get excommunicated or yelled at by the priest.
"J F'n C!" he yelled when the church lights went out and the ghost of the last pastor came back.
She said "J F'n C!" when the kid in front of her dropped a whole bag of candy corn on her head.
He screamed "J F'n C!" when the pastor started singing hymns in the middle of a thunderstorm.