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.
Using the term "My jam" has superceded just being relevant to a specific song that is your favorite.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.
OMG guys...guys this. Is. My JAM!! I just...just have to rance.
shh, my jam is on. SHUT UP, THIS IS MY JAM This is my jam... no guys i'm serious, it's blueberry jam. It's awesome.
Shit, I missed my jam.
The word for invoking the action of turning on fun and amazing music in a white creeper van in Miami. Making the car swing from side to side and beat boxing / handwaving may occur
Hey Jose the radio sucks... can you Bump my JAms!!!
Ashley this song is too slow.. bump me some rap music