I don't know what a Jersey is. Isn't that a type of cow?

[He's frowning, his forehead furrowed with little lines that prove that Vasquez definitely doesn't really know half of what anyone is talking about here, which only gets worse when Waverly talks about something called an appletini. The lost look on his face is probably clear and he feels like he should be apologizing.]

What's an appletini? I mean, I assume it has apples, but I'm lost from there.