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Typical of the male human condition, concern that one's penis is insufficient in length and/or girth and/or shape and/or form and/or smell to be appealing to potential sexual partners when exposed.

Manifests as hiding one's penis with elaborate hand gestures whilst using a urinal, populating one's pants with socks and other padding, excessive engagement in oral and digital sex, a preference for sex in darkness and showering alone.
Chris: Mike, how was your date with that hot drummer on Saturday night?

Mike: It was great, but when I got back to her place, I had to run outside naked and pull the fuses for the house to make sure she'd still let me do her.

Chris: Mate, you have Guy Syndrome.
by The Evil Evil Muppet January 26, 2014
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