Mummy Dust 

Mummy Dust – a slang term referring to components, ingredients, or accessories that manufacturers add to their products to enhance them, but which have no useful, or scientific basis for inclusion.

Vitamins added to shampoo are just mummy dust.

Mummy Dust by Joanne King October 5, 2006

Mummy Dust 

When you hit a really stupid person in the head, the only thing that comes out is Mummy Dust.

I hit Vicky in the head and the only thing that came out was Mummy Dust!

Mummy Dust by Kinser9 July 21, 2004

Mummy Dust 

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"

Mummy Dust by SteveEP November 10, 2010

Mummy Dust 

Slang for ketamine

He hit that special k so hard mummy dust came out his mouth

Mummy Dust by S$money November 13, 2018

Mummy Dust 

Really terrible dried up marijuana....so dry and brown that not only will you most likely not get high, but you will most likely get sick (if you don't get sick from smoking it, you will get sick from the sight of it). Stoners know that you go to great lengths to smoke, and will smoke almost anything, but mummy dust is just so bad and not worth it. By the time you light the blunt, the weed has already disappeared.

Guy 1- "Yo man you got any of that weed left?"
Guy 2- "Yea i got like an 1/8th of mummy dust left"
Guy 1- "Fuck that man I don't wanna get high anymore"

Mummy Dust by Smoke Trees Everyday November 8, 2009

Mummy Dust 

a cloud of skin, feces, dirt and scalp dandruff, that can be found on the unwashed clothes and bodies of homeless and or drug addicts. Similar to the dust found in a mummies crypt.

Bruh, I gave this homeless guy a ride home when he pop'd out of the car he left me in a could of his mummy dust.

Mummy Dust by Brogantac January 9, 2018