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Generally small red berries found on schrubs that can be taken off by the handfull and thrown at passers-by.

Heckleberries are the weapon of choice of Darryls (see definition derived from derelicts) or Hecklers.

Origin: 1987 Tam High School, Marin County CA
Hey, that punk sittin on the front wall just tossed a heckleberry at me
by Lowe, md November 11, 2011