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A man who is either infertile, or has erectile dysfunction (inability to develop or maintain an erection).
Gary never has sexual intercourse because he is a juin.
Thomas and his wife can't have children because Thomas is a juin.
by sousuke February 03, 2009
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2
Juin (pronounced Joon) is a person, generally male, who tries hard (too hard) to impress girls but always fails.

Also, they are usually unsuccessful in many other aspects of life, especially their social lives, and are therefore often referred to as noobs.
1. "Dude, you have no idea how to get a girl's phone number. You're such a Juin!"

2. "Tony never leaves his house, his name should be Juin."
by speter03 January 17, 2009
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