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The friend who only talks to you when their real friends are busy and stuck in traffic. They never ask you to hang out unless it's the only thing left to do.
'Hey, wanna hang out? My real friends are stuck in traffic and I'm bored.'
'I'm gonna text you because I don't know anyone else to text.'
'I'm coming over because my real friends are at the mall and I'm too lazy to go with them.'