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The act of using unfair means to overtake another player's car whilst playing racing games. This can involve pushing them off the track or hitting them with weapons. In games such as Micro Machines it is possible to tonk someone with a frying pan.
"I only lost because Mike is a big tonking bastard!"
by Microphone February 07, 2006

1. to beat an opponent clinically
Everton FC gave Sunderland a facking tonking this weekend.
by Lank Boy November 26, 2007