Tit to Tank originates from my first ever trackday. I was leaning away from the corners so the instructor who came out with me was giving me body position tips.

 

He explained that if I was turning right, the left side of my chest should be against the right side of the tank and vice versa. I acknowledged this as, left tit, right tank - tit to tank.

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T3T is my inconspicuous cover for Tit to Tank. TBH, the 3 kinda looks like boobs which is why I chose this over the obvious number 2. Also, there were very few variations left in acronym terms.