By now you already know Spanish is spoken in lots of countries and every one of them has their peculiarities. I am a big fan of the Mexican accent and I have found this video where a kid explains the basics for sounding like a Mexican. Here are some words he uses:

Güey – dude, man, guy. It is used mostly as a noun (Hey, güey, vente ‘pa cá.) or as adjective, meaning ‘tonto’ (stupid). (Qué güey soy, se me olvidaron las llaves dentro del coche.)

¿Qué onda? / ¿Qué rollo? – How are you?

No manches. – When something goes wrong, instead of cursing, say No manches.

¡Chale! – Damn it!

Chavo – boy. Some variations are cuate, morro and bato.

¡Qué chido! / ¡Qué padre! – How cool! That’s cool! The opposite expression is ¡Qué chafa!

Nos vemos muy pronto!