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4.
To stop someone from talking or persuing another person.
Larry-Yo im bout to go talk to that girl over there.

Sam-Naw man I dont think she likes you.

Larry walks over to the girl and tries to talk to her but Sam keeps interrupting the two's conversation.

Larry-Stop Cop Blocking Dawg

Sam-Ma Bad
by Noah Nwachukwu June 23, 2006
 
1.
To keep police accountable through the documenting and filming police action. Also includes the act of jury nullification for laws that are unjust or victim-less.
I have jury duty, I hope I get a drug case so I can do Cop Blocking today.
by NicholsSA September 16, 2012
 
2.
blocking another person from trying to holla at someone
man chill with all dat son, you be copblocking like sh!t
by misz_capricorn October 24, 2007
 
3.
The act of impeding or preventing a police officer from doing his or her job. Common examples include flashing headlights to alert other drivers that a cop is waiting up ahead, asking a cop inane questions while they are in the process of giving someone else a ticket, or wasting an officer's time in any way, shape, or form possible.

May also refer to the game of Copblocking, where players "rat out" a cop's speed trap to would be speeders, preventing the cop from giving any tickets.
So I totally slowed down right before we made the turn and missed that ticket -- fucking copblocked that mother fucker!

Yesterday Jon and I went copblocking for a couple of hours. Shut down this one po-po for a good thirty minutes, bitch didn't write a single ticket.
by DPSkitty March 19, 2010