1. (verb: Roasting) cooking a food (typically meat) over a fire
2. (adjective: Roasted) the way food has been cooked.
3. (noun: roasted) Insulting someone on the internet.
3. Richard: I'm confused why homeless people can have cellphones
Joe: You're confused about how a home costs more than a phone? Is this your first day on earth?
A holiday sex move, when dirty hot sex has been going on for a long period of time, raising the body temperature of the man in turn raising his semen temperature. He nuts on the womans chest, thus a roasting chestnut.