A tonka is a big car. usually a SUV, that is also fast asf, usually powered by a V8-engine and in some cases V10.
Examples of a tonka is the Jeep Trackhawk, Dodge Durango SRT Hellcat and the quintessentialLamborghini Urus (a.k.a Lamb Truck).
The term has been used for a long time but recently got a revival after our lord and saviour YEAT started using it.
Person 1: "I was riding round in my tonka"
Person 2: "What the fuck are you saying?"
Person 1: "I'm quoting Yeat, shut the fuck up you not my twizzy."
TonkaSaw is the prime example of an internet tough guy. Challenges another YouTuber, Andy Warski, to a fight. He claimed that he was some pro MMA fighter yet he would not show his face norr would he show proper fight footage. Instead, the fight footage that was found on YouTube showed very gay WWE larping. Long story short, the retard hyped himself up and never showed up to the fight cuz he was "harassed" by a phone call and had to "change his name".