The Spirit of Thanksgiving is when one member wears a pilgrim hat, and the other wears an Indian headband. Then one of the members stuffs their asshole with stuffing and tops it off with gravy. The other member then proceeds to eat out all of the stuffing and gravy while listing the things they're thankful for. The member with their asshole being eaten has to gobble like like a turkey while being eaten out.
Dave: "Dude so I heard you went to Jessica's house last weekend! How was that?"
Jim: "It went well bro, I really showed her the spirit of Thanksgiving."