Gwynnifer is Jeff’s code name for Britta. … We had decided that actually, he’s not calling anyone on that phone. He had a date with Britta and he’s letting her know date’s off. And Britta’s making a comment there about his underwear. There is no Gwynnifer. She knows that too.
-Dan Harmon (2x08 Cooperative Calligraphy, Community S2 dvd commentary)