look up any word, like cunt:
 
1.
Grotum is the crust the grows on unwashed scrutums. It is know to be a "gross scrotum" thusly "Grotum"

*See also the fetish of grotum: "totem of the grotum scrotum"
Example: She wouldn't give him head because he had a film of grotum on his scrotum.
by Gatez September 03, 2005