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 by Razeur June 28, 2014

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 by Alex Hartley October 24, 2008

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!

Slow-Burner by Keithen March 16, 2004