A shittercritter "shih ter krih ter" is a
person who makes more money turning
tricks in the
bathroom than they do at their actual job, which is implied to be a stripper.
Yeah, we all call her a stripper, she says she's one, and her
taxes say it; but she makes more money blowing guys in the
bathroom at
work than she does as an actual stripper. The bathroom has worse lighting, which means more money for her. Hence, she's a shittercritter.