I'm sure you've received plenty of e-mails about the June 2 HighWays Express column, but Tout Jour Prest is nonsense.
It doesn't mean anything. In French, 'always ready' is written 'Toujours Pręt.' Maybe this is Medieval French?
That doesn't take away from the inspiring message, but I hate to think of the poor guy who has a nonsense phrase tattooed on his arm.