Of or pertaining to extreme dominance. This type of mentality describes that which was commonly seen during the 1980's. Competition, wealth, and power were of extremely high importance during the decade so it was both expected and common for an individual to go above and beyond on a consistent basis.
"William Wallace had an 80's mentality during the Battle of Stirling." -A reference to the scene in Braveheart when William Wallace soundly defeated the English.