G.S.I. Gross Sexual Imposition
G. S. I. is when someone tries to stick their junk on you during a sexual case, but no actual sex happened. Even if they had sex with you before, it still counts as G. S. I. if they didn't leave hair or cum on you.
My teacher tried to touch me but didn't leave anything behind. I said 'you didn't even leave a mess!'
He had sex with me before, but this time he just tried to hug me. I called it G. S. I. and he got mad.
She tried to grab my butt during class, but I said 'you didn't even leave hair!' and she got in trouble.