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A sexual act involving filling a woman's anus with danish cream filling via a turkey baster, then two or more males engage in sexual intercourse with said anus. Afterwards, everyone eats the danish cream filling, hence the "thanksgiving".
Baltzer: "So I was at my friend Sigmund's house with some other guys and this freaky chick Adelina let us do a Danish thanksgiving on her!"

Lars: "So did you eat the Danish cream filling?"

Baltzer: "Yeah man you know it!"

Lars: "Wow you're one sick fucker"
by Betrayal, Inc. October 24, 2011