Scoring low on the excite-o-meter

• Sound signifying that one is not impressed
• "It's not that exciting"
• Unimpressed feeling
• Unenthusiastic response
• "Whatever ..."
• "It's okay, I guess"
• Expression of apathy, in modern lingo
• "Doesn't matter to me"
• "I've heard better ..."

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
expression of apathy or indifference, by 2003 (perhaps from 1992).