Unt Unt
"Unt unt" is more of an onomatopoeia than an actual word. The production of this sound is produced by raising the back portion of the tongue upwards for the first "unt" and then downwards for the second. This sound may sound more nasal-like due to the positioning of the tongue. This sound is made often in response to a statement or question in which the speaker disagrees with.
"Did you see her new outfit?"
"Unt unt, what did it look like?