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1.
A description of mannerisms or behaviors commonly distinguished by their abjectly heterosexual, alpha male motivations. The term references character Steve Stiffler, an outspoken would-be playboy with shades of decidedly latent homosexual tendencies and a heart of gold, from the popular American Pie movie series.
In Stiffler-esque fashion, Jack decided to bring his own penis as his date to Senior Prom.

"Dude, hiding a camera in the girls' locker room would be totally Stiffler-esque."
by C. Austin April 18, 2010