cop lock Share definition Flag The gridlock that occurs when there's a cop driving on the highway and no one will pass it. Why is every single car driving 60 mph on the highway -- even in the fast lane?Dude -- there's a cop up front. It's cop lock. cop lock by skidd1 November 7, 2010 0 0 Get merch Get the cop lock mug. Buy Now — $32.95 See more merch