The Big Turkey is the Turkey with the largest pectorals. In crazy attempts to show his dominance, he will go as far as killing them in the process.

Big Turkey is also used as an Xbox term when speaking of an expert Halo Player. Big Turkey's generally range between 20-30 kills per game.
"I just got wrecked by the Big Turkey..."

Hmu xbox live @BigTurkey9er9er
by TheOfficialWiki August 20, 2016