The Local Way to Say It
Hacer un sinpa" is quintessential Madrid slang for doing a "dine and dash" – leaving a bar or restaurant without paying the bill. It's super informal and you'd only hear it among friends or in a lighthearted, gossipy context. You definitely wouldn't use it in a formal setting! It literally means "to do a without-pay," a playful shortcut that captures the essence of the act. Imagine your friend recounting a wild night: "¡Madre mía, Carlos casi hace un sinpa en el bar de la esquina!" (Oh my gosh, Carlos almost did a dine and dash at the corner bar!) Or, if someone's being cheap: "Ese tío siempre intenta hacer un sinpa, ¡qué vergüenza!" (That guy always tries to dine and dash, how embarrassing!) It's a quick, vivid way to describe a very specific, cheeky action.The 'Grammar Math'
The "grammar math" behind "hacer un sinpa" is quite simple and powerful in Spanish. It falls under the umbrella of verbal expressions where the verb hacer (to do/make) combines with a noun or a nominalized phrase to create a specific, often idiomatic, action.The formula is:
Hacer + [informal noun/phrase] = [perform an informal action]
In this case, sinpa is a colloquial shortening of "sin pagar" (without paying), effectively turning the phrase into a noun. It's similar to how we say "hacer la compra" (to do the shopping) or "hacer la cama" (to make the bed). You'll find this pattern everywhere in Castilian Spanish, allowing for concise and expressive communication. It's a verbal shortcut that native speakers use intuitively.