The remains of a dick so old that it turns into dust.

When a male inbetween the ages of 75 and 95 masturbates so hard the skin on his penis slowly starts to come off but because the male is so old it does not come off normally but rather falls off and turns into small little dandruff like flakes known as dick dust.

Dick Dust (verb): The human male act of brushing said male's penis along side some body part of human female in close proximity. Commonly done by middle school boys to girls in science class where both male and female students stand by each other in close quarters playing with beakers and Erlenmeyer flasks.

Not to be confused with the "womb broom" which is the same as the dick dust but where the male/female species role is reversed.

that which dick cheese is made of.

The residue left behind from a hot night of sex that dries and flakes off your cock