Possible Clues:

• "Cool, man!"
• Beatnik's ''Gotcha''
• 'Gotcha, daddy-o'
• 'With ya so far'
• 'Yeah, man!'
• Beatnik's "Gotcha!"
• Beatnik's "Understood!"
• "Understood," hippie-wise
• Beatnik's 'Gotcha'
• 'Word'