Interrupting or making rude comments to someone giving a speech, performance, or presentation in order to annoy or disturb them.
From 'heckle,' which originally meant to comb fibers like hemp or flax (from Old English 'hackle'). The meaning shifted metaphorically to 'to harass with questions' in the 18th century, as the combing action was compared to roughly challenging someone's words.
How wild is this: the word 'heckling' comes from combing wool, and both actions are about roughing something up and separating the threads—when hecklers interrupt speakers, they're literally 'unraveling' their presentation just like a hackle unravels fibers!
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