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The Gish gallop is a rhetorical technique in which a person in a debate attempts to overwhelm an opponent by presenting an excessive number of arguments, without regard for their accuracy or strength, with a rapidity that makes it impossible for the opponent to address them in the time available. Gish galloping prioritizes the quantity of the galloper's arguments at the expense of their quality.

The term "Gish gallop" was coined in 1994 by the anthropologist Eugenie Scott who named it after the creationist Duane Gish, whom she described as the technique's "most avid practitioner".[1][2]

Strategy
During a typical Gish gallop, the galloper confronts an opponent with a rapid series of specious arguments, half-truths, misrepresentations, and outright lies, making it impossible for the opponent to refute all of them within the format of the debate.[3] Each point raised by the Gish galloper takes considerably longer to refute than to assert. The technique wastes an opponent's time and may cast doubt on the opponent's debating ability for an audience unfamiliar with the technique, especially if no independent fact-checking is involved, or if the audience has limited knowledge of the topics.[4]

The difference in effort between making claims and refuting them is known as Brandolini's law[5] or informally "the bullshit asymmetry principle". Another example is firehose of falsehoods.