Refers to a female's luscious ass. Applicable to jailbait, sorority sluts, MILFs and possibly even GMILFs for some of the more dsisturbed members of our society.
1.) Jim: I love when Alexis wears those spandex workout pants...
Joe: Yeah, you totally get a great view of her scrunion!
2.) Man, Cathy's ass is scrun-diggly-umptious!