Exclamation of distaste

• Cry made while holding one's nose
• ''That's icky!''
• "I'm not eating that fruitcake!"
• "How icky!"
• Grunter's sound
• "That stinks!"
• ''That's disgusting!''
• "Oh gawd!"

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ugh \Ugh\ ([oo^]), interj. An exclamation expressive of disgust, horror, or recoil. Its utterance is usually accompanied by a shudder.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1765, imitative of the sound of a cough; as an interjection of disgust, recorded from 1822.