A long, pendulous scrotal sack that can wrap itself around objects and thereby move them. A kind of gonadal bolas.
Sometimes when I stand up after taking a shit, my grapple-sack snags the toilet seat and lifts it up.
A person who is attracted to people with Down's syndrome or some other form of mental retardation.
Damn, that Mike loves his girls stupid -- he's probably a chromosome chaser.