Historical clue formulations

• "That's cool, daddy-o!" — 2021-07-28
• "Gotcha, man!" — 2019-06-09
• "Cool, man!" — 2016-02-19
• "Cool, dude" — 2014-04-04
• "Gotcha" — 2011-10-14
• "Gotcha," to a beatnik — 2008-06-15