When you smile at someone because you have no idea what they are talking about. This is mostly done by forigners because they don't understand, but sometimes the person is just ignorant.
Pedro had no idea what he was being told to do, so he just put on his best "forigner smile".
Tim:I gotta go calm Ashely down tomorrow, she's going through another breakup. After Ashely I'm going to go talk to Sam about her divorce....
Bill: Dude, you have have too much frienergy, if keep it up you'll be running on empty!
Kendall: Don't worry too much bill, Tim has a lot of frienergy on reserve, he lives on that shit.