It literally means "put the" but the actual meaning depends on the context.
For example:
* "Meta la mano" means "Put your hand in"
* "Meta la llave" means "Put the key in"
* "Meta la carta" means "Put the letter in"
To translate "meta la" accurately, you need to know what the object is that is being put in.
Let me know the full phrase or sentence you want to translate, and I can help you with a more accurate translation!