"If you speak Spanish, I'll give you a big hug and a kiss on your cheek."
Here's a breakdown:
* Si hablas en español: If you speak Spanish
* te doy: I give you
* gran abrazo: a big hug
* y un beso: and a kiss
* tu cachete: on your cheek
This phrase is likely a playful or friendly way to express a willingness to embrace someone who can speak Spanish.