A backup friend is someone who's used as a 'backup' for whenever someone else's friends don't wanna hang out, or cant hang out with them.
You don't wanna be the backup friend.
"Robin is just my backup friend, I don'tactually like her."
A friend who you can only stand for short periods of time; four hours for example. One can be really good four hour friends, but it must be maintained only in short durations.
Oh yeah, me and Natalie are four hour friends; once we hang out for five hours we just scream at each other.
A friend who is always nice to someone, but the second they're not with them they act like they hate them and talk bad about them
Tony is always nice to Sarah first period, but during second period all he does is talk bad about her and say how she is the scum of the earth. Tony is a total two faced friend.
A Gummy-bear friend is a friend you can always rely on to talk to when your sad. Gummy-bear friends are lovable people you just want to hug and love. Gummy-bear friends are funny and easy to talk to and super adorable. If you find a Gummy-bear friend keep them! They are very rare.