The $10 million man had a previous best game of 283 running metres, set in Round 15 of the 2017 season against Melbourne.
On a rainy Saturday night in front of a home crowd, he smashed his own record, steamrolling St George Illawarra for a total 301 metres according to Fox Sports Lab.
Taumalolo surpassed his own 283-metre record with 12 minutes still to play in the game. It took him 20 carries to do it, which took him to 287 metres for the night. He then had one more to crack the triple century.
Cowboys skipper Michael Morgan put it simply.