(noun) Referring to a person who is about as useful as the mold on which would grow on your hiney; useless. Sometimes exclaimed in anger, as a diss.
"You hiney mold! Why did you drop all the cards?!"
"My hiney mold of a sister was hogging the computer last night."
"My hiney mold of a sister was hogging the computer last night."
by Matchless May 8, 2007