>>9 Tanaka, from what i can assume, is kind of a mod on the board, dealing with plenty of the shit that users come up with. He's probably just frustrated. You saw the sage checkbox on the side right? that makes it so that threads are not bumped to the top of the page due to a new reply. Bump is a comment on a thread, moving it towards the top. hence, Sage (Sageru) and bump.
also /sage for unimportant conversation.