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When you are driving on a 2 lane road/highway and the two cars in front of you are pacing each other and you are unable to pass them.

A similiar situation to when you are playing the game of Parchesie and you can block your opponent from moving around the board when 2 of your color pawns occupy the same space
Oh man! Look at this Parchesie block! I can't even go around them. One of them better move or I'm gonna explode!
by msbitch June 17, 2009
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