An insider interview with the artist Lena reveals that Eren's tattoo reads "IT'S MALE TIME" with his ding-a-ling featured as the special mail delivery. You're most certainly welcome for uncovering that sweet gem. Also Levi's thigh tattoo says Ereri.
Someone from Cambridge posted a whisper, which reads "My mom died 4 years ago, my new boyfriend will never meet her last night he looked at my tattoo of her name. He kissed it and whispered "thank you for making your daughter.