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to say to someone, 'you could survive a car crash' implys that they are fat, therefore would not be killed in a car crash due to all their 'padding'. in extreme cases, 'crash crash' can be exchanged for 'plane crash' or even 'a armageddon'.
Bek: OMG, I am getting soo fat lately!

Christina and Taylah: you could survive a car crash.
by C/B/T February 04, 2009
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