"Turkey Day" is a synonym for Thanksgiving, as I said before. It is mainly used by lameasses and weather-reporters who have nothing better to do than act stupid.
"Shut the hell up, you stupid arse.
Guy 2: What the hell does that mean?! Do you mean Thanksgiving Day?
Guy 1: What's Thanksgiving? Are you talking about the day you eat turkey meat?
Guy 2: Never mind...
"its turkey day. so i gotta cook all this food."