Incest friend group is when the people in your group have been or are dating
Hannah says that since izzy and Jason are dating their friend group is now an incest friendgroup
An incest Friendgroup is when normally a larger Friendgroup mixed with both boys and girls and they date each other. The dating span could be weeks to months to years. But they always break up and they both date someone else in their Friendgroup while remaining close friends with their ex's.
Hannah used to date Troy and Troy used to date Madison but now Hannah is dating John and Madison is dating Hunter and Troy is now dating Ava.
Yet they all remain close friends regardless of having awful breakups and they act as if they never dated, passing each other around like blunts and knowing what each other taste like.
I.E an Incest Friendgroup