YOO

Set to 6 different clues across 14 published puzzles, most often "___-hoo!" — The New York Times, Monday, 17 March 2008.

3 letters

Every clue on record, most used first

"___-hoo!"6 times
The New York Times — Monday, 17 March 2008
___-hoo4 times
The New York Times — Friday, 15 October 2010
First half of an attention-getteronce
The New York Times — Sunday, 25 February 2001
"Hoo" precederonce
The New York Times — Sunday, 28 June 1998
"_____ hoo!"once
The New York Times — Tuesday, 14 February 1995
_____-hooonce
The New York Times — Wednesday, 13 April 1994