What is Double Melt?
1.
1. A kind of burger with two kinds of cheese melted over the burger patty.
2. Two different guys cum into a girl's mouth, on her tongue, with one wad of cum landing on the other, hence the two "melt" into one another and over the edges of the girl's tongue.
Larry and Steve planted a double melt into Carla's mouth. OR:
"Triple X Blowjobs" featured an awesome double melt scene.
See