What is baba aadam ka jamana?

The literal translation of "baba aadam ka jamana" is "the era of Adam and Eve." In general usage, it refers to a very long time ago, or to a time when things were very different from how they are today.

For example, someone might say "In baba aadam ka jamana, people travelled by horseback" to indicate that this was something that happened a long time ago, before the advent of modern transportation.