Yes, Travis Pastrana does have a tattoo on his right upper leg (tigh) but nobody knows what it is. check also out this link, you can see a littlebit of it there:
http://nitrocircus.com/2009/09/travis-pastrana-on-ice/
YES RIGHT LEG
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he does have a tattoo its on his right thigh, it seems to be some sort of scroll.
I think that it is a toilet paper roll. It is because of the 720 he has been working on for years and has never landed it. It is a reminder of all the hard work he put into trick.