"Most dishonoraburu!" (pronounced dishonorabroo) is a phrase used to express disapproval. It is a parody of the way the Japanese transliterate and pronounce English words. It basically works with any English adjective ending in "-ble" (e.g. "incrediburu", "invinciburu").
Even though the phrase originates with Phraser, the chat will occasionally use it to troll his failures when playing games.