A derogatory term for a woman of mexican or other hispanic descent, brought from the fact that cleaning women of such descent seem to stack pairs of shoe upon one another when they're finished cleaning.
Why the hell would I even want my shoes ontop of eachother?
Cameron: So I hired Maria to clean my house today, and she did a pretty good job. I don't know why you gave her such a bad review, man.
Devin: NO! !Dude, go look at where you usually put your shoes
Cameron: -looks- WHAT THE HELL?
Devin: SHE'S A FILTHY SHOE STACKER.