A large snake, preferably a Python. Substituted for turkey on Thanksgiving when turkey is unavailable (or too expensive) but snakes are plentiful, as in when you're fighting a tired war on the Ho Chi Minh Trail in Cambodia, or bringing a dish to a Washington Thanksgiving potluck.
"I, uh... I brought a Cambodian Turkey."
"That smells delicious. What exactly is that?"
"It's a nineteen-foot python."
-Penny Arcade, November 24, 2010