Here's a breakdown of the phrase:
* Vais: This is the first-person singular present tense form of the verb "aller" (to go).
* Changer: This is the infinitive form of the verb "changer" (to change).
So, put together, "vais changer" means "I'm going to change," and it expresses a future intention.
Here are some examples of how the phrase might be used:
* "Je vais changer de vêtements." (I'm going to change clothes.)
* "Je vais changer d'avis." (I'm going to change my mind.)
* "Je vais changer mon numéro de téléphone." (I'm going to change my phone number.)
The context will determine what is being changed, but the core meaning of "vais changer" is always "I'm going to change."