1. When a group of girls go out for the night with no male company. Also known as a "girl's night out."
2. Can also be applied to males, in an insultory fashion. Anytime a male goes to a nightclub, dance club, or similar establishment, no matter what his intentions are, he can be said to be clubinitnopenis. The implication is that in going to said establishments, the male is relinquishing his "man card."
Definition 2 is synonymous with douchebag, gay, fag, etc.
2. Yes, but you don't want to be clubinitnopenis yourself...