A term used when someone feels either so excited or happy about something that they are compelled to make a sound. It can can also be said when someone feels disgusted about something. It can be used positively or negatively depending on when and how it is said."Eughy!" is also commonly used while sticking both hands out and shaking.
Fusun: The concert's in TWO DAYS! EUHGUGHUEH!
Both of us: EUHGEUHGUHEGHY!!!