uhn tiss
a sound you make when you want to annoy someone, usually said as one word (uhntss). said fairly quickly (uhntss uhntss uhntss). also the name of an awesome song by the bloodhound gang
me: uhntss uhntss uhntss uhntss....
joe pancakes: stop it you're so annoying!
me: uhntss uhntss uhntss uhntss...
joe: that's it, i'm going home.
me:uhntss uhntss uhntss uhntss..

~that's the proper way use the word 'uhn tiss'