• 'Beats me!'
• Ain't got a clue
• Beats me, in the comics
• Beats me, slangily
• Can't answer that
• Claim of ignorance, slangily
• Dull grayish brown, no? I have no idea (5)
• Got me!
• Grunt accompanying a shrug
• I ___! (Search me!)
• I give up!
• I'm stumped!
• No clue
• Noncommittal response (slang)
• Search me
• Shrugger's word
• Slangy Beats me!
• Slangy expression of ignorance
• Verbal shrug
• Ya got me!