RASH refers to the aftermath of rawdogging activity, while D refers to the male sexual organ. Combined (DRASH) they require a shot of penicillin and an explanation to your friends.
"Drash & burn Jester's dead...but seroisuly I think I need another shot of penicillin. Sorry for partyin"
by Craig Paul May 27, 2006
A rash, or sore in the shape of a horizontal line on the inside of upper and lower lips that a girl with braces gets after sucking dick.
"She sucked my dick last night, but said she'll never do it again because of the awful drash that she got."
by BCVHBH February 11, 2007