What is the English translation of: Que veut dire VTT?

in english it means "Means ATV"

What does VTT mean?

Thank you, Ms. Sue :)

You're welcome, Erika.

Véhicule tout-terrain

According to the Petit Robert dictionary, it also stands for
vélo tout-terrain, which means
mountain-bike.
So the meaning can differ from one country to another.