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A girl who stays friends with the guys just so she doesn't get stuck with the guy who always forgets to do his homework. She's like the invisible friend who never gets noticed, while the girlfriend is front and center like she owns the car.
You're still friends with Jake even though he's dating Sarah now. You're just the backseat buddy.
You're not the one who got kissed in the hallway. You're the one who got the pop quiz.
You're the one who gets the homework when the guy forgets. Again.