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 quintessential Lamborghini 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."
An absolutely foolproof way to keep minors from viewing content deemed "too mature" for them to watch.
Billy: "So I was trying to watch some videos for an M rated game, and I ran into an age gate, so I put in my real birthday. SOMEHOW it managed to figure out that I am 12. CURSE YOU AGE GATE!!!"
Bill: "Fucking age gate! *quick scroll* THERE! I was born on January 1, 1904. Fuck you age gate."