Acronym for "Don't Be a Dick;" a sacred code of conduct among honorable male circles. Much like the ancient concept of chivalry, but more intrinsic and fundemental.
Matt: Hey, can you turn it down? it's, like, 3 a.m. and I have a test at 8!
Sean: hell no!
Matt: dude, DBD
Sean: aw yeah, sorry dude. go get some sleep. *music stops*
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i.e. Permanent Down Low --> To keep something quiet forever
Yeah, there's gonna be drinks, but my parents will be there so we gotta keep it PDL.
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