I had lunch with a girlfriend.

我同女友一起吃的午饭。

《牛津词典》

I met a girlfriend for lunch.

我和一个女伴一起吃了午饭。

《柯林斯英汉双解大词典》

youdao

May I call you Patty. and treats it like a girlfriend. He names it Patty and treats it like a girlfriend.

VOA: special.2009.08.21

His friend told me that he doesn't have a girlfriend, but I'm not sure.

他的朋友跟我说他没有女朋友。可我还是不清楚。

I want to 实战 - SpeakingMax英语口语达人

This is a search box that every Chinese is familiar with, but when you look at people's needs, people are typing all kinds of queries in this box. For example... "A great MP3", "Where can I find a girlfriend in Beijing?"

这是一个中国人都很熟悉的搜索框，但是当关注到人们的需求时就会发现，人们在框中输入,各种关键字。,比如，“听起来让人觉得开心的MP3“,“北京哪里能找到女朋友结婚？“

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

After quite a few hamburgers, a girlfriend convinced me to try an authentic Italian dinner.

WSJ: Chef Carla Hall on Learning to Love Food in Italy | Traveler's Tale

We all have our fingers crossed that our male will soon find himself a girlfriend.

BBC: Osprey moves into man-made nest

"I hate the term 'bachelor pad, ' " says Mr. Davis, who currently has a girlfriend.

WSJ: Looking Out for No. 1 - WSJ Mansion