1. What does it mean?
똥캐 combines 똥, poop, with 캐릭터. Players use it to complain that a character performs badly, is awkward to use, or seems far weaker than other options. It is an evaluation of game performance, not a formal character class.
Also written or said as ttongkae
2. The nuance
The wording is coarse and subjective. Avoid treating an old complaint as current balance information or insulting someone for enjoying a character others dislike.
3. Examples
“다들 똥캐라지만 나는 조작감이 좋아서 골랐어.”
Everyone calls this character trash, but I chose them because I like the controls.
“패치 전에는 똥캐 취급을 받던 캐릭터야.”
Before the patch, this character was dismissed as weak.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.