He is a fast friend of mine.

他是我的可靠朋友。

youdao

Mole made the door fast, threw the satchel into a drawer and locked it, and sat down quietly on the table by his friend, waiting for the strange seizure to pass.

鼹鼠关紧了门，把背包扔进一个抽屉，锁好，然后静静地坐在朋友身边的桌子上，等着这阵奇怪的邪魔过去。

youdao

That is, unless you're making a passing remark about your friend with a fast metabolism who can eat anything and everything.

换句话说，除非你正随口评论了一位怎么吃都不会胖的朋友时，你会觉得她的代谢比较快。

youdao

Sometimes a person may be upset because he does not have something as nice as a friend has, like a fast new car.

VOA: special.2009.11.15

And you're at a fast food restaurant with your friend.

现在你和你的朋友又来到一家快餐店。

I'm worried 课堂 - SpeakingMax英语口语达人

"It was all so fast, there was no time for anything, no time for crying over a friend, " he said.

NPR: No Alarm, Only 1 Exit In Brazil Nightclub Fire

She was an easy mark when a friend invited her to an April seminar held by a company called BigSmart.com that promised fast money on the Internet.

FORBES: Con.com

"The problem is that today's online services turn friendship into fast food -- wrapping everyone in 'friend' paper, " Google executive Vic Gundotra writes in a blog post.

CNN: How Google+ compares to Facebook