Rohan ends up looking at Masazo Kinoto's back, and becomes possessed by the Stand Cheap Trap. Because any attack on Cheap Trap would just come back to Rohan, he can't attack it, which puts him into a dilemma. Meanwhile, Josuke and Fungami are looking for Koichi when are approached by a young man who has a Stand who can trap anyone inside pieces of paper. He pulls out a piece of paper from his pocket, which happens to have something hidden inside...
It basically means that you're 
using a Stand to attack yourself.
هذا يعني أنّك تستخدم ستانداً لمُهاجمة نفسك
Du hast dich soeben
selbst angegriffen.
En esencia,
te estás atacando a ti mismo.
En esencia,
te estás atacando a ti mismo.
En gros,
tu t’es attaqué toi-même !
In pratica significa
che attaccando me, attacchi te stesso.
Isso significa que você usou
um ataque de Stand em si mesmo.