That's my jam!

It's a term for your favorite,or one of your favorite songs. It's usualy yelled out loud when someone hears his or her favorite song in the radio,disco,etc.

Something/someplace that you personally like.

often used when someone tries to steal your jam

Using the term "My jam" has superceded just being relevant to a specific song that is your favorite. It is relevant to any specific subject matter. It is used to describe any specific thing that you feel you enjoy more than the majority of other options in the same category.

Defined as not something I like or something that I'm into doing.

Your favorite song when you hear it you go crazy.

your favorite song at the moment. Or the jam that you eat.