Mummy dust is things that have happened in the past. They're history, old news. Things that people won't let go. When old people talk about "well back in my day." Or people who are always bringing up stories from high school. Shit's mummy dust.
"Corey Colteaux is always talking about high school, always bringing up mummy dust."
E-40 Revenue Retrievin': Day Shift (Everyday is a Weekend) lyrics -
"saw some suckaz I don't trust (what they do)/
got to bringin' up old mummy dust/
pullin' up the past/
talkin' loud like a big mouth bass"
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