Does anyone have an idea? Close friends? I usually see this term in stories where the friends were best friends and then they fight for some reason.
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Etymonline provides some background:
The sense of "fast" here is almost obsolete; it's the "fast" of "steadfast," as noted by RegDwight above. It means "tight" or "secure," and you'll see it in literature in expressions like "hold fast" meaning to "get a tight grip" (on something). "Hold fast to your dreams" means to keep them close and never let them go.
Which is exactly what you should do with a good friend.
A pairing of two or more people whom quickly become close and find each other disposable; similar to fast food : readily available and enjoyable at the time.