What it means
詰んだ is a casual way to say you have reached a dead end or have no workable move left. People also use it jokingly for small setbacks, so the actual seriousness depends on context.
How to use it
Use it with friends when a situation feels impossible or when you want to dramatize a minor mistake. It comes from shogi, where 詰み means the king cannot escape. For serious trouble, explain the situation instead of relying on this informal shorthand.
Examples in conversation
Where it comes from
詰んだ is the past form of 詰む and comes from shogi. In shogi, a king is checkmated when no move can prevent capture; the Japan Shogi Association describes 詰み as a position where the king will be taken regardless of the next move. Everyday and online usage extends that dead-end idea to difficult situations, sometimes humorously.
Related slang
Further reading
We use references to check meaning and background. Examples on this page are original.