abbreviation for down down low, which is an extreme form of the rather common dl or down low, referring to the necessity of keeping a juicy tidbit of information hushed up.
"Whoa, you hooked up with HIM?!?!?!?!"
"Yeah, but let's keep it on the ddl. He's pretty skeevy. I was too drunk to know what I was doing."
"Oh, okay, I won't say a word."
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