Top Definition
A kneejerk reaction to a startling event. Best used in church as not to offend any priests, pastors or flanderizez.

Abbreviation for Jesus Fucking Christ.
J F'n C, your breath be smellin like wale pussy!
by Christ0 November 30, 2006
1 more definition
J F-in C

Jesus F**kin Christ
person 1: i puked after 8 beers

person2: JFnC u amateur
by frprtz October 20, 2009

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