Come again?, 4 letters
Could you repeat that?, 4 letters
Say again?, 4 letters
Seriously?, 4 letters
Whadja say?, 4 letters
What the...?, 4 letters
What was that?, 4 letters
Whuzzat?, 4 letters
2001 Jadakiss song Un-___!, 4 letters
Snorting sound, 4 letters