(one's) jam noun phrase informal slang
Used to describe one's favourite song.
Whenever I come to my friend’s cafe, I require the waiter to turn on my jam.
My younger brother kept turning up his jam while I was doing homework last night. This made me annoyed.
Something that a person loves or cares about.
I don't want to race the horse as it isn't my jam.
Playing the guitar is his jam, so I think I will give him a guitar on his birthday.
Confusion made worse than before.
There was heavy traffic on the way to work this morning. Confusion worse confounded when some drivers were arguing with each other right in the middle of the street.