Slow burner
A song (or performance thereof) that doesn't immediately impress you, but becomes increasingly enjoyable on subsequent renditions. Antonym: pop hit.
J-Dilla's "Donuts" took me a while to get into, but now I love it. It's a real slow burner.
Slow Burner
Someone who it takes some time to realize the amazing-ness of. Someone that you become truly passionate for. Also, anything with this quality.
Kate is a total slow burner. At first I didn't think there was much there, but now, good God!
Slow-Burner
Sticky weed, that burn slow. Also known as fruit.
Man, don't cop that twenty sack from the south side, go get it from Keithen, he got that slow-burn..that sticky-icky! One hit and you gone have to put that out!