mod. overly responsive; out of control. : She can get so spastic when I come in late.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
spastic (adj.)
1753, from L. spasticus, from Gk. spastikos "afflicted with spasms," lit. "drawing, pulling," from span "draw up" (see spasm). The noun meaning "a person affected with spastic paralysis" is attested from 1896; derogatory slang shortening spaz first recorded 1965.