To cover the nakedness of some shameless hussy with the smiling visage of Dwayne "The Rock" Johnson.
When the naughty bits of an otherwise NSFW image are covered by a certain image of American wrestler/actor Dwayne "The Rock" Johnson an image is said to be (The) Rock blocked.
Poster 1: starts thread asking for the original of an image of some random actress, whose nudity is covered by an image of The Rock.
Poster 2: provides original image of The Rock wearing a tuxedo at some Hollywood party.
Poster 3: lulz, you got rock blocked!
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