This is a Spanish proverb rather than slang. It literally translates to 'A friend in adversity is a friend indeed'. This means that true friends are those who remain with you during tough times.
Examples
- Spanish: Cuando perdí mi trabajo, José estuvo allí para apoyarme. Realmente, un amigo en la adversidad es un amigo de verdad.
- English: When I lost my job, Jose was there to support me. Truly, a friend in adversity is a friend indeed.