When a guy goes over to a chicks (milf) house to help her kid or kids with their homework (schoolwork). The milf cooks him dinner and has sex with him in exchange for help with the kids homework. It is a play on the word homework.
It is much better to do milfwork than homework. Thank god I am good at math, that chick is dying now that her son is in algebra 1. She wants me over every night to help with his math homework. She is wearing me out. Thank god I am good at math.