The Ol' Time-of-Day

Sex.

But used in a pseudo-mockingly "I'm going to pretend I'm a dude in the 40's and say things indirectly in a nice way" kind of way.

Man 1 - "So, Pal, didja' giv'er the ol' time-of-day?"
Man 2 - "Well, gee, I'm not the kind to kiss-and-tell!"