Tiger is the seat behind the driver seat. This refers to Tiger Woods, the famous golfer who often finds himself behind a driver (a kind of golf club). This is similar to Cobain, the seat behind shotgun, a term which refers to the singer's tragic death, which is still a mystery.
Person A: "Road trip! I'm driving."
Person B: "Shotgun!"
Person C: "Cobain!"
Person D: "Ah fuck, I guess I got Tiger."
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