'I'm beat!'

• Sound made while wiping away forehead sweat
• "That stinks!"
• Cry of relief
• "Thank goodness!"
• "So that's done!"
• Expression of relief
• "What a relief!"
• Sound of disgust
• "Is it ever hot!"

Wiktionary Word definitions in Wiktionary
interj. Used to show relief, fatigue, surprise, or disgust.