Colloquial term for a large drink, often alcoholic.
Cenamos con un copazo de vino tinto, lo que hizo la noche aún mejor.
We had dinner with a big drink of red wine, which made the night even better.
Después de un largo día, me preparé un copazo de vino tinto para relajarme.
After a long day, I prepared myself a big glass of red wine to relax.