G.S.I. Gross Sexual Imposition
G. S. I. is when someone tries to touch you in a sexual way, but there's no actual penetration. If it happened during sex, it becomes rape.
My teacher tried to touch me during class, but I said 'it's not rape, it's G. S. I.'
He touched me, but it didn't go all the way. I called it G. S. I. and got him in trouble.
During sex, he tried to touch me again, and I said 'now it's rape!'