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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
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A classic holiday sex move, one person fills their mouth with the hot sauce of their choice. The male partner then proceeds to tea bag their partner's hot sauce laden mouth until his nuts are ablaze. Said partner then rubs his roasting nuts on their chest until climax henceforth screaming "Happy Holidays ya filthy animal."
Dude last night I pulled a roasting chestnut on your mom underneath the mistletoe. That shit was on fire!
by LooseHawgs17 January 24, 2016
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