Shortest form of "sorry for the dark joke", used before or after a racist or bad taste joke
"Did you hear about the kid that has been found dead?" "Yeah, but don't worry I already checked, it's not mine", "wtf bro sdj"
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An acronym for someone who really pissed you off. The acronym stands for: Some Damn/Dumb Jackass.
"I'm pissed off"
"Why?"
"SDJ didn't give me my change"