One writer covering another writer's name with his/her own. Also known as 'X-ing out' or 'crossing out'. 'Crossing out' is usually just that, painting an X over another writers tag or piece. In the early days of New York graffiti, Cap was the master of doing black and white throwups to go over people. There was even a crew called TCO (the cross out... Found on http://www.graffiti.org/faq/graffiti.glossary.html
a review, examination, or investigation: The accounts were given a thorough going-over. · a severe, thorough scolding. · a sound thrashing; beating: The hoodlums gave him a good going-over when they found him. Found on https://www.infoplease.com/dictionary/going-over