I Have a Question - Difficult Customer

Hey again,What did I learn today in EnglishPod?

It's Lession 0002 Difficult Customer.

New Vocabulary:

complimentary:free

causel :relaxed,not dressy.

impatient : uncomfortable waiting, wanting to go

grab: get quickly

Got some new food for me.(maybe I can try how to make them.looks good.)

spaghetti

meatballs salad

Questions:

1).When people will use "grab"? how to use?

2).about "casual" ,I don't know how to use it.

3).

B: Ill go with the spaghetti and meatballs,salad and
the wine.

A: Excellent choice.Your order will be ready soon.


B: How soon is soon?

A: Twenty minutes?

B: Youk now what? Ill just go graba burgeracros
the street.

:-( I don't understand what is mean "just go grab a burger across the street"

难道,那个餐厅在马路的对面?客户坐在餐厅的马路对面?还是我理解错误了?

有谁可以帮我么?谢谢.