A person who is someone you know and are "friends" with, but isnt treated like a friend. You are treated like an acquaintence. This is a person one only talks to when their actual friends are away. The person who is the back-up friend is treated poorly and is usually someone who doesnt have a lot of friends or gets a lot of dates. The backup friend is someone who gets the short end of the stick when it comes to friendship. The person who sees you as a backup friend doesnt care about you and isnt concerned with any part of you as long as you are someone they can come to when they want to converse with someone when their real friends have disappeared.

A term used to reference cannabis/marijuana/weed.

A friend who isn't really part of the group, but who you hang out with when the rest of the group is gone.

an acquaintance that is only spoken to when all of one's real friends are absent.

a friend who you use as a backup while your real friend is absent or gone or away at the moment

A person you are friends with, but is treated poorly, and is talked to when your friends are absent. The person who sees you as a backup friend does not care about you, and you get screwed over.

someone you are friends with, but doesn't make the list(first cut, VIP, ect) for an activity, and then is called upon to fill in when a "Real friend" cannot be there