The boundary of a friendship. It refers to the type of relationship you share with a person and the subject matter/actions deemed acceptable.
A guy orders coffee at a new cafe and the Barista asks how many phone numbers he got last night. Guy says "Whoa! Outside the friend band yo!"

Bob and Sally are on a second date. Bob asks Sally "Hey Sally, what 'kinky' stuff do you like?" She replies "Our friend band hasn't stretched that far yet."

Best girlfriends of 6 years could say "Don't get offended, but its within our friend band for me to ask you this. Have you considered waxing your mustache?'
by thepretties&&thebrains January 9, 2011
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Friend that is in band.

The relationship works the same way as a friend's does, but they are in band.
Colorguarder: My band friend said there was no practice tonight. Is that true?
Colorguarder #2: Oh yeah, I've talked to all my band friends and they've said the same thing.
by ☆〜(ゝ。∂) November 12, 2015
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