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A permenent crook in the neck (usually tending to stick at a 45 degree angle to the left or right) due to the over-eating abuse of hardshells tacos. The unnaturual exertions placed on the neck due to the "crunchy taco eating bend" develop into taco neck syndrome.

Reports have shown that cases of taco neck syndrome have been developing more and more frequently in instances of use with Taco Bell's new crunch wrap supreme, as well.
Shaquille O'Neal exhibits acute taco neck syndrome in his free throw shooting.
by Matt Ramamama July 02, 2006