R & S Regulars, what does the term 'Crypto Jew' mean? Is it a real thing?

It came up in this question:

http://ca.answers.yahoo.com/question/ind...

I am not even sure what the dude is talking about...I googled it & came up with:

http://en.wikipedia.org/wiki/Crypto-Juda...

Can anybody explain, is this a real thing?
Update: @ הבת שלנו ששמה חוה עליה נולד Why I ask if its real? Not everything I've learned about on answers or Wiki is...so I am seeing what other opinions are on here. It has happened in the past, then I've been set straight by my contacts that I've fallen for a line of bull....since this was something... show more @ הבת שלנו ששמה חוה עליה נולד

Why I ask if its real? Not everything I've learned about on answers or Wiki is...so I am seeing what other opinions are on here.

It has happened in the past, then I've been set straight by my contacts that I've fallen for a line of bull....since this was something I'd never heard of before...I thought 2nd, 3rd, etc, opinions were called for.
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