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.