Young people are hearing the damaging phrases 'that's so gay' and 'you're so gay' every single day at school.
To tackle this problem, Stonewall Cymru has teamed up with Will Young and Mumsnet to give schools, teachers and young people the tools they need to challenge homophobic language.
We've created new posters and guidance for both pupils and teachers across the country that will challenge misuse of the word gay.
Download the whole series of posters here.
Download our teachers' guide here.
We also need you to get involved. Stonewall Cymru and Mumsnet are asking parents, pupils and supporters to write to and tweet their local schools to find out what they're doing to deal with this language.