Epizeuxis

In rhetoric, an epizeuxis is the repetition of words in immediate succession, for vehemence or emphasis.

Examples:
 * "O horror, horror, horror." (Macbeth)
 * "Words, words, words." (Hamlet)
 * "Rain, rain, rain, rain, rain." (Kay)
 * "Developers, developers, developers, developers, developers, developers. Developers, developers, developers, developers, developers, developers, developers, developers!" (Steve Ballmer)
 * "Education, education, education." (Tony Blair)
 * "Never, never, never quit." (Winston Churchill)
 * "Location, location, location." (Common phrase tied to real estate)
 * "The horror, the horror" (Kurtz in Heart of Darkness)
 * "No, no, no!" (Margaret Thatcher)
 * "Simplicity, simplicity, simplicity!" (Henry David Thoreau in Walden)
 * "Scotch, scotch, scotch, scotchy, scotchy scotch." (Ron Burgundy in Anchorman: The Legend of Ron Burgundy)

Such repetition is also used in writing and song:

Alone, alone, all all alone, Alone on a wide, wide sea".

— Samuel Coleridge in The Rime of the Ancient Mariner

Round here we stay up very, very, very, very late".

— Counting Crows in Round Here