Mackenzie Hansen crossed for a hat-trick as the Brumbies ran in nine tries to thrash the Waratahs 61-10 in a lopsided Super Rugby AU clash at GIO Stadium in Canberra.
The hosts made it 17 wins in 18 games at home, scoring 35 points without reply in the second half of proceedings.
Waratahs actually opened the scoring through a Will Harrison penalty, yet Rob Valetini, Hansen, Noah Lolesio and Connal McInerney all grabbed tries to make it 26-10 to the hosts at the interval.
Harry Johnson-Holmes had gone over for a score after 30 minutes that Harrison also converted, yet the overwhelmed Waratahs were ripped apart after the break.
Wing Hansen crossed again in the 56th minute before completing his treble with nine minutes remaining. There were also tries for Nic White, Lachlan Lonergan and Tom Banks, while Lolesio kicked five conversions to give the fly-half a personal haul of 15 points.
Replacement Ryan Lonergan took over kicking duties to land three conversion attempts following his introduction, helping the Brumbies claim their biggest ever win over their domestic rivals. It is also their biggest margin of victory in a Super Rugby fixture over a fellow Australian team.