Nappy Rash 

The irritation or annoyance resulting from a relationship with a significantly younger partner.

Adam(26): I shagged that 19 year old chick the other night and now she won't stop texting me and stalking my facebook...
Joe(25): Sounds like you got a nasty case of nappy rash!

Nappy Rash by BlackBlades September 5, 2012

sex rash 

The chafing a woman feels after having sex with a man with pubic hair. Similar to "crotcht-rot" in a man. It is the result of skin, hair, and moisture rubbing vigorously against each other during nasty love-making.

"I have a sex rash from your pubes rubbing against mine during that doggie-style sex we had."

sex rash by Buck Studley November 6, 2013

resin rash 

The blob or smear of marijuana resin on your lips and/or tongue after smoking a hit from an uncleaned pipe or a fat gooey joint.

"Hey guy, you need to clean that pipe cause it's giving everyone resin rash."

"Shit man, that's good weed... two puffs on the doobie and I'm getting resin rash already."

resin rash by greenman61 December 5, 2013

grave rash 

An STD which one contracts following a sexual encounter with a crusty corpse. The precise cause is unknown, but likely results from the deceased having had any or all of the following: chlamydia, gonorrhea, crabs.

Friend 1:(While scratching genital region) Ugh, I think I caught something from your grandma last night.
Friend 2: Dude, my granny's dead.
Friend 1: I know, I almost threw my back out digging the bitch up, then she gives me a raging case of grave rash!

grave rash by Twig'n'Barry February 19, 2014

road rash

the abrasions that result from falling (especially falling off of a vehicle)

When that car almost crashed into me, I lost consciousness. When I woke up I had learned that I had major road rash

road rash by The Return of Light Joker February 14, 2008

penis rash vest 

a condom, latex like product to prevent pretty much everything.

Thank goodness, I had my penis rash vest on last night or else I would have contracted her infection.

penis rash vest by Calvin Swemmer October 25, 2008

tit rash 

a rash, on da tit, or titties

chrissypoos momma has tit rash

tit rash by Jordan,gordan,pordan August 14, 2006