Can you name this Family Guy episode?!

I forget what the episode was about, but in it Peter was in the bed of a pickup with some migrant Mexican workers and he said to one of them 'me llamo es Peter, (and then do you speak English or some line like that)!. The Mexican dude said back to him in perfect English 'Actually, you don't need to say the 'es', you can simply say me llamo Peter'
Peter says 'Oh, so you can speak English' (or something)
and dude responds, 'Actually no, i only know what I just said and now this sentence explaining it'
Peter - 'You've gotta be kidding me'
Mexican 'Que!?'

Prolly not exactly how it went down, but 10 points if you can name the episode and season!.
ThanksWww@Enter-QA@Com

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