Another word for cocaine. This name for it is mostly used by people who have to deal with coke heads such as police, bar staff, doormen etc...
"That bloke has clearly been on the cunt dust"
The dusty residue which puffs out of a vagina that hasn't been used for a long time.
Sam: I pulled a granny last night
Darryl: What was it like?
Sam: She puffed out a shit load of cunt dust which settled in my hair. After that, she went like a train!