Mind your language, kids!!!

One of my 4th grade students pointed this to me today.
"Not me," he said. I realized it must have been from the previous class that I had.
"What is it in English?" I asked.
He look at his friend and just said, "Bad word."

So I took a pic of it & asked my Korean friend what it meant.
"Son of a b*tch"

...written by a 3rd grader!
*sigh*