In Spanish slang, 'vaca' is often used to refer to a shared expense or the act of splitting the bill. Originally, the term 'vaca' means 'cow' in Spanish, but in this context it derives from the idea of 'making a cow' which means everyone contributing a little.
Examples
- Spanish: Vamos a hacer una vaca para comprarle un regalo a Juan.
- English: Let's all chip in to buy Juan a gift.