Minnesota Vikings player Isaiah Rodgers ' Halloween costume was ass -- literally -- 'cause the defensive star rocked a BBL costume this year ... and the decision earned him a trophy!!

The team's Halloween bash went down this week ... with players, including Rodgers and Will Fries , taking a party bus to the event. Play video content

While many went with classic cartoon characters or movie costumes ... Rodgers and his fiancée, Genie , decided to take things to the next level.

The Vikings' cornerback rocked a full bodysuit with massive boobs and butt ... while Genie joined Rodgers as his plastic surgeon, clearly having fun as she inspected her "work."

Rodgers' efforts earned him "The Funniest Costume" award at the party. His teammate, Fries, also won an award for his Beetlejuice f

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