A combination of oils, dead skin cells, feces, and semen. Often found in women who don’t wipe their ass properly and have recently received back shots.
Bob: Are you cheating on me? I can feel that plum gum all over my dick!
Johnny gave Jessica a Gum ring shows the word "gum ring" being defined.
Gum, a hashish like form from marijuana. Since "gum" traditionally is the sap from a tree, marijuana is a softwood plant so it has no sap but resin , this pressed together makes
gum
"This guy on the street sold me some ganja gum"
"The gum made me stoned