Slow Burn is a popular trope where the characters of the main pairing start off not in a relationship and focuses on the slow development of a romantic or sexual pairing. They get to know each other deeply before engaging in any sort of sensual contact.
Girl 1 : "If you could experience one trope what would it be"
Girl 2 : "Definitely a slow burnromance"
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!