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1) When someone thinks they are great at something, but they are really bad at it; often used sarcastically.

2) When something is spectacularly bad.
1)
- What did you think of the show?

- Well at least the band seemed pleased with themselves.
- Yeah, it was pretty lextacular.

2)
- Man, that new Britney Spears album is so bad I feel embarrassed for her. Really lextacular.
by JohnMaledictus June 04, 2019
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