Pulling 2006, S1 E6 Part 1, video by BBC

Louise s mother, Eileen, arrives at the flat and announces that she is moving in. She has left her (younger) boyfriend and is gagging for it. She goes to a club with Karen and Louise where she embarrasses them by simulating Lesbian moves with her daughter, in order to attract male attention. Donna s efforts to impress Sam s friends are equally disastrous and he eventually tells her to choose between him or Karl.