Weird shit I say or hear at school

Incest

It was the first week back from summer and I was pretty bummed, but while I was walking to my fourth period the guy in front me on the stairs told his friend,

"...yeah but it ain't incest if you put it in her butt."

I tripped on a step and tried not to laugh going up the rest of the stairs.

He kinda looked horrified that I heard.
I still see the guy around school and he kinda gives me this, 'Fuck that's the girl I said some dumb shit in front of', look.