cuff your jeans

The thing lesbians and other female members of the LGBTQIA+ community do to show that they are, in fact, a female member of the LGBTQIA+ community that can develop feeling for another female (who is not always a member of the LGBTQIA+ community and is usually their best friend)

*Could also be used as a metaphorical phrase that helps you let other people know you like girls, even though you might be wearing a skirt at the moment