Acronym: F**k Your God Concept.

Used by atheists and believers alike to respond to those who over-proselytize, who assume all around should share their religious fervor, or who otherwise wear their own personal spiritual beliefs on their sleeves in front of complete strangers for no good reason.
Zealot, to all within earshot: "Isn't this just a lovely day our blessed Lord has given us today? Praise be it and all the glory to Him!"

Annoyed bystander: "FYGC!"
by The Speed Racer December 19, 2010
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