T...E..E............F?

The other night just before bed, Ethen and I were talking and he reminded me about his trip to the woods with Dave and Chris. He rode w/ Dave and Chris on the ATV up some pretty good hills and through thick brush. Daddy was such a stud and carried him during the walking parts of the trip (to see the waterfalls on Dave and Cheryl's property). Daddy got a few scratches on his legs, but they are all better now. Anyway, at the end of the story, he was telling me he went on Dave's T...E..E.......F? What do you think Dave, can we rename your ATV to a TEEF?