Excuse me ,what the meaning of "like knows like"?
It depends on the context. Here's an example,
Max: Our boss is really cheap! We paid for our own lunch. Again!
Pat: Look who's talking. When was the last time you bought us lunch?
Max: But ...
Pat: Like knows like. In other words, because you don't buy lunch for others it's more than likely that you will recognize people who do the same. "like knows like"
All the best.