This is both a Word of the Day and a figure of speech. (Double word score?)
Definition: Repeating a word (or phrase) for emphasis. (Usually 3 times.)
For example, if you asked me what I did over Christmas, I might say: Eat and drink, eat and drink, eat and drink.
At which point, you might say: I heard you. I heard you. I heard you. (Or: Shut up! Shut up! Shut up!)
Epizeuxis is also very popular among small children. Frequently found in wheedling requests (demands?), like:
Want to watch Play Schoooooool! Want to watch Play Schoooooool!
Or, when expressing the negative when asked questions like: Do you want to go to bed?
No, no, no, no, no, no!
At which point, you say: Enough of your epizeuxis; the time of crepuscular bedlam has passed! It’s ablution o’clock!
…
No, no, no, no, no, no!
(I find I tend to mainly use epizeuxis with swear words; like when I curb a wheel on my car. See also, lalochezia.)