What do you do when you run out of lines on your book?
You look at the emo girl and say, "Hey, can I borrow your arm?"
Borrow an Arm
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Explanation
Experiment
Explain Bear
Okay, so like, emos are known for self-harm, right? And you're probably a dumbass who doesn't read books so you don't know that books have lines, you dumb dumb. So the joke is that the emo girl's arm can be used as a replacement for the lines in the book because she probably has cut marks on her arm. You probably have never even read a book, you illiterate.