Possible Clues:

• "Gotcha," in the '60s
• Hepcat's phrase of understanding
• Beatnik's "Gotcha"
• 'Gotcha, daddy-o!'
• ''Understood,'' hippie-wise
• Beatnik's 'Gotcha!'
• Beatnik's "Got it"
• Beatnik's "Understood"
• "With ya so far"
• "Got it, man!"