Grudiron = The field on which UT plays. Ex. Bama left it all out on the grudiron, but even their best effort wasn't enough to beat the Vols.
Grupendous = Anything relating to something awesome, phenomenal, unbelievable. Ex. The UT quarterback had another grupendous day and the Vols won their tenth game in a row.
Gru-pon = Special discounts recieved for wearing UT gear. Ex. The liquor store owner was a VFL and gave me 50% off because of my Vols cap.