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(märk`bär)n. a break-through scientific event of granola bars discovered by Mark Twain Henley the third, during the 1990's. The MarkBar™ is a granola bar composed of raw element which can cause adrenaline and increase of testosterone within a matter of minutes. Many people in language arts classes search for these bars to increase their energy. But they are only for emergency purposes.; slang. something that gives you energy.
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