What does 什么每天 mean?
In the usage of "什么...之类的" or "什么...啊，什么...啊", 什么 is used for citing examples, with the connotation that there're so many such kind of things.


  ⑦用在几个并列成分前面，表示列举不尽：～送个信儿啊，跑个腿儿啊，他都干得了。


(used before several parataxises, expressing can't list all of them)

For this sentence it could be translated as 


  such as 每天用老公的牙刷刷马桶，and 把排泄物混到料理里微笑着看他吃下去 etc，可以拿去回答「人性到底可以有多阴暗」了。