Related Clues:

• 'Way cool!'
• ''Peachy!''
• ''I didn't know that!''
• ''Impressive!''
• Whiz starter
• ''Keen!''
• ''No kidding!''
• Far out
• ''Gosh!''
• Expression of surprise
• ''Groovy!''
• Relative of 'Hmm ...'
• 'You could've knocked me over with a feather!'
• With 60-Down, ''Wow!''
• Command to a horse