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!
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!
by Twig'n'Barry February 19, 2014
Get the grave rashmug.