Sentence:  The place was n't particularly busy at that time of night , and the girl who was <WSD>waiting</WSD> on me , who was clothed in the tightest-fitting pair of slacks I had ever seen on a woman and a sweater that showed everything there was - and there was lots of it - wanted to be sociable . 
Meaning of the word marked with <WSD> tags:  serve as a waiter or waitress in a restaurant