Gynoberry
A token female friend or member of a group, there only to ensure the group isn't entirely male and avoid a Sausage Fest. From gooseberry.
"Anna says to tell you she won't come along as a gynoberry to your Ruby on Rails meetup."
"Sucks. It'll be a total Sausagefest now."
"Sucks. It'll be a total Sausagefest now."