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1.
A portmanteau of tasty and sexual. Something that is so delicious, you can't really describe it.
These red hot gummy bears are tastual.
by Tee-Racy March 27, 2007
 
2.
Something that is intended to be tasteful but utterly fails, and is instead tacky.

A white-trash version of ghetto fabulous
Your collector plates are very tastual.
by j daggar January 24, 2004