"In like Flint" was a common saying back in the 60"s. Before the James Bond movies, James Coburn made a couple of spoof spy movies, "Our man Flint", etc, and he played Derek Flint. He was pretty good with the ladies, so we use to say "I'm in like Flint", when things were going well for yourself, with the ladies, or anything else.. Also, before that in the really old days, back in the 40's (before my time), Errol Flynn, the movie star, use to have women lined up outside his dressing room, waiting for a little romance with the dashing star, so the term was "In like Flynn" during those days...for the same reason. So, I hope that I "scored" on the Ganzaa, so I'd be "In like Flint!!
I Hope this holds up and I didn't speak to quickly! Good luck!