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A disorder specific to young Christian males in which strong instincts to treat females like idealized sisters-in-Christ are perpetually warring with awkward and guiltful sexual longings towards the aforementioned sisters-in-Christ.

When these sexual longings are consummated via even minor sexual affection with an actual sister-in-Christ specimen, the CGS sufferer immediately experiences such guilt that the idealization is destroyed and the sexual attraction is dramatically but temporarily repressed.

CGS manifests itself in myriad ways, including self loathing, purity oaths, increased accountability group attendance, excessive use of the word "stumbled" and unpredictable social behavior wherein the affected individual sends a strong mix of conflicting interest-signals towards any woman to whom he is attracted until she cries, screams or schedules a meeting with her high school youth pastor, who, still recovering from his own CGS, hands her a copy of "I Kissed Dating Goodbye" by Joshua Harris.
Girl 1: Why is Preston so sweaty and sad looking, I thought you guys had a good date last night?
Girl 2: We did, but he kissed my forehead and our cheeks touched and then he freaked out.

Girl 1: Sounds like a bad case of Christian Guy Syndrome.
Girl 2: It's not as bad as some I've seen, but I think you're right.
by jp-c August 09, 2015
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