a t -like sound produced by suction rather than plosion; conventional spelling pronunciation, tŭt
(a sound) Used to express impatience, annoyance, mild rebuke, etc.: a click, or sucking sound, made by touching the tongue to the hard palate and rapidly withdrawing it: usually repeated one or more times (tut-tut)
Used to express annoyance, impatience, or mild reproof.
Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
Origin of tut
Compare Swedishtut (“a point, pipe, tube"), Danishtut (“a cornet").