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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.
Tim: Hey Dale what are you doing christmas day?

Dale: Visiting my in-laws at 5 which will lead to a roasting chestnut with my wife in her parents bed.

Tim: :/
by brandon2k9 December 02, 2009