What does "playing wingman" mean?

So I really like this guy and he tells me all the time that he really likes me too. We live kinda far from each other and don't get to see each other very often. Last week we were talking and found out that we wouldn't be able to see each other this past weekend, but that we were going to try to see each other this weekend coming up. Today I was talking to him and asked if I was going to get to see him this weekend and he said that he might have to work. He then said that he might also have to "play wingman for his buddy." What exactly does this mean? Is he going on a double date with his friend? Or is he just trying to set his friend up with someone?
What does "playing wingman" mean?
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