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A quick googling for the etemology reveals this:
http://www.etymonline.com/index.php?term=tilt
O.E. *tyltan "to be unsteady," from tealt "unsteady," from P.Gmc. *taltaz (cf. O.N. tyllast "to trip," Swed. tulta "to waddle," Norw. tylta "to walk on tip-toe," M.Du. touteren "to swing"). Meaning "to cause to lean, tip, slope" (1594) is from sense of "push or fall over." Intrans. sense first recorded 1626. Meaning "condition of being tilted" is recorded from 1837.
Associating the idea of being physically moved and being emotionally moved is not too big of a stretch. DIgging through some etymology books may shed some more light on the actual connection to poker, as I'm sure you need something a bit more concrete than this. But if it were simply that when you're on tilt, you're shaky and not playing steadily... that would be enough for me personally. Good luck. Let us know if you find anything cool in there.
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