German virgin
In poker, a starting hand of two nines. So called due to "nine, nine" sounding like the German nein, nein, meaning "no, no." Having been dealt a German virgin right off the bat, I was hoping for a third nine to be laid on the table.
virgin territory
Completely unexplored or untested field(s) or area(s) of activity. The entrepreneur made his millions when he set up one of the world's most popular search engines back when the Internet was still considered virgin territory.
virgin ears
Said of a person who is or seems particularly young or innocent (and thus has not been exposed to much profanity or other inappropriate talk). I can't curse in front of him—he's 10 years old and still has virgin ears! Please go upstairs—the story I'm about to tell Is not meant for virgin ears.