What is Copposter?
1.
Any person who drives a white car of the same make and model as the local law enforcement, thereby causing fellow motorist to hit their brakes before they realize its just another civiilan
I was doing 90 down the freeway and had to hit my brakes becasue I ran up on a cop, then I realized it was just a copposter.
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1.
This occurs every year on the 16th July.
This is the day when you change your font on your instant messenger such as msn or yahoo etc....