The meaning of the Red X

I drew this last year. It was a parody of asking a guy in my class to read one of my alien sci-fi stories wanting his opinion and critisim. I was ready for his opinion and after reading it he looked on the back of it and saw a red "X". This was in my freshmen year so I decided to draw it anime style. You wouldn't really really get the joke unless you went to the same school that year, but it it's something to chuckle at.

*Names have been edited out for a reason.