"I could take it or leave it," slangily

• Unenthusiastic response
• Sound signifying that one is not impressed
• Neither great nor terrible
• "Big deal"
• 'I'm not impressed'
• "Not a big fan"
• Slangy way to say "whatever"
• "It's just OK"
• "I'm not feelin' it"

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