What does ad scrub mean?

ad scrub meaning in Urban Dictionary

(v.) A quick, yet work preserving activity enabling a view of a YouTube video from starting to end uninterupted by YouTube pop-up ads.The activity requires pausing the movie because it loads, after that pressing and dragging the navigtional-tool on video clip timeline through the ad (making the ad appear) then to the beginning of the video. Now, the audience simply closes the ad and is today able to view the video clip from the start without having to shut the ad during the clip.