In colloquial Spanish, the gerund is often used to express a command that indicates the start of a process. It is mainly used with specific verbs; the most common verbs are "andar", "caminar", "circular", "marchar".

Here are some examples:

Vamos, saliendo todos despacio y en silencio.Come on, everyone come out slowly and in silence.

Ya son las tres. Andando, que llegamos tarde.It's 3 already. Let's get a move on, we're late.

¡Circulando! Solo ha sido un pequeño accidente.Keep moving/driving! It was just a minor accident.

¡Corriendo que nos mojamos!Hurry up, we're getting wet!

It is very common in bars and restaurants to hear the waiter say ¡Marchando! after taking a customer's order as a way of letting the kitchen know that they need to start preparing that particular order. For example, a customer says:

Me pone dos cervezas y dos tapas de calamares, por favor.
Can I have two beers and two squid tapas, please?

The person taking their order can reply to both the customer and Antonio in the kitchen:

¡Marchando, dos cervezas y dos tapas de calamares, Antonio!Coming up, two beers and two squid tapas, Antonio!

It is also common to use the gerund in a stronger command, with a threatening tone and an expectation that the action in question must be done immediately, using this construction:

ya + estar + gerund

For example:

¡Ya estás largándote de aquí, caradura!Clear off right now, you're shameless!

¡Ya estás devolviendo el dinero que cogiste!Give back the money you took!

There is a colloquial set phrase in Spanish, indicating to get on with things, to move on:

¡Andando que es gerundio!Let's move on!
 
¡Arreando que es gerundio!Let's move on!

This is used in any context to express the desire to keep things moving.

 

 See also Using preposition a + infinitive to express a command and Using que + El Presente de Subjuntivo to express a wish/command

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Examples and resources

Vamos, saliendo todos despacio y en silencio.Come on, everyone come out slowly and in silence.
¡Circulando! Solo ha sido un pequeño accidente.Keep moving/driving! It was just a minor accident.
¡Arreando que es gerundio!Let's move on!
Ya son las tres. Andando, que llegamos tarde.It's 3 already. Let's get a move on, we're late.
¡Andando que es gerundio!Let's move on!
¡Marchando, dos cervezas y dos tapas de calamares, Antonio!Coming up, two beers and two squid tapas, Antonio!
¡Ya estás largándote de aquí, caradura!Clear off right now, you're shameless!
¡Ya estás devolviendo el dinero que cogiste!Give back the money you took!
¡Corriendo que nos mojamos!Hurry up, we're getting wet!
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