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1.
When someone puts pop rocks in their mouth and gives a blowjob.
"I totally blew a huge load from the cock rocking she gave me last night."
by slowfib & blorgetta September 08, 2009
 
2.
The opposite of cock blocking; a friend who helps you get pussy
Nick: "You this kicks ass, erika was totaly cock rocking last night!"

Danielle: "I know, you tapped that shit
by Nick Sanchez (Yeah, that guy) December 06, 2008