A subspecies of the typical frat-boy type: misogynistic, politically conservative, alcoholic, horny, Abercrombie and baseball cap wearing jock. "Birkenjocks" differ from the typical frat-boy only in their recreational choices, smoking pot and listening to bands typically associated with a more liberal lifestyle, like Phish, Dave Matthews Band, Pearl Jam, Bob Marley, and 311.
"Brah, I got SO drunk last night at the Alpha Sigma party, and I TOTALLY fucked this chick from the Omegas. I don't even know her name! Anyway, dude, you wanna get stoned and listen to some DMB?"