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.
by Buck Studley November 6, 2013

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."
"Shit man, that's good weed... two puffs on the doobie and I'm getting resin rash already."
by greenman61 December 5, 2013

Guy 1 : Dude, whats up with your face?
Guy 2 : Oh I know. I made out with Matt Ragh last night.
Guy 1 : Got a case of the Matt Rash. Nice one bra.
Guy 2 : Oh I know. I made out with Matt Ragh last night.
Guy 1 : Got a case of the Matt Rash. Nice one bra.
by jarpag October 13, 2010

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!
Joe(25): Sounds like you got a nasty case of nappy rash!
by BlackBlades September 5, 2012

When that car almost crashed into me, I lost consciousness. When I woke up I had learned that I had major road rash
by The Return of Light Joker February 14, 2008

by Jordan,gordan,pordan August 14, 2006

When you're overweight enough to have your thighs scrape against each other when you walk or run, and after a long day of walking or running, you get a horrible red rash on your thighs that you have to nourish for at least a day.
by Dennis P May 29, 2005
