User blog:Mgf60/Profanity in Vol.3 Chapter 151

When there is profanity in korean media then it is common for one of the hangul to be covered with an "X", which has happened several times in Tower of God so far.

The profanity used is "고X" by Lo Po Bia Shilial Zahard, which uncensored is "고자", meaning Eunuch and is a crass way of calling someone impotent. The whole sentence is "..당신 혹시 고X 라든가 여자 라든가.", which becomes "..당신 혹시 고자 라든가 여자 라든가.", and it translates to "...Are you an eunuch or a woman?".