"Boy, that was close!"

• Leader of House gets installed in seat — what a relief!
• Sound of disgust
• Cry after a close call
• "Close one!"
• Sound made while wiping away forehead sweat
• "Glad that's over!"
• "That wasn't easy at all!"
• "That stinks!"
• Relieved sigh

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